25th Infantry Division (United States)

Also known as: Tropic Lightning — the standard nickname, from the division's rapid campaigns · Tropic Lightning Division · 25th Division — the wartime styling · Electric Strawberry — soldiers' slang for the taro-leaf patch · America's Pacific Division — the division's motto styling in its current posture

Both sides of the 1945 Luzon passes, the Ombudsman succession, and the MOA-AD ruling

Definition

The 25th Infantry Division — “Tropic Lightning” — is a United States Army infantry division stationed at Schofield Barracks, Hawaii, constituted on 26 August 1941 from the pre-war Hawaiian Division and activated on 1 October 1941 at Schofield Barracks, “slightly more than two months” before the attack on Pearl Harbor. Its first regiments were the Regular Army 27th and 35th Infantry of the old Hawaiian Division and the Hawaii National Guard’s 298th Infantry; the 298th transferred out in 1942 and the Washington National Guard’s 161st Infantry became the third regiment on 3 August 1942. The division “led to the adoption of the nickname ‘Tropic Lightning'” through its rapid movements across the Pacific, and it wears a taro-leaf-shaped patch — in soldiers’ slang, the “Electric Strawberry.” (Wikipedia — 25th Infantry Division)

The division’s Philippine record is its defining campaign of the Second World War. After Guadalcanal — first elements ashore near the Tenaru River on 17 December 1942, combat from 10 January 1943, Kokumbona and the Mount Austen pocket, organized resistance ended 5 February 1943 — and the New Georgia campaign of July–October 1943, the division landed on Luzon in the San Fabian area on 11 January 1945, swept the Central Plain through Binalonan (17 January), Umingan, Lupao, and San Jose, and then fought the Battle of Balete Pass from 21 February to 31 May 1945: Major General Charles L. Mullins’s 27th, 35th, and 161st Infantry driving Lieutenant General Yasuyuki Okamoto’s Japanese 10th Division up Route 5 until the pass was secured on 13 May, Santa Fe entered on 27 May, and the link-up with the 32nd Division near Imugan on 29 May opened the Cagayan Valley. (Wikipedia — 25th Infantry Division, Wikipedia — Dalton Pass, CMH — The Bambang Front II) The war cost the division 5,432 battle casualties — 1,236 killed, 4,190 wounded — and its service has run from Korea and Vietnam to today’s Indo-Pacific rotations, including Exercise Salaknib in the Philippines. (Wikipedia — 25th Infantry Division, U.S. Army — JPMRC-X in the Philippines)

Identities

Source Type	Identity
Wikipedia	25th Infantry Division (United States) (verified this session)
Wikidata	25th Infantry Division (Q217777) — “active United States Army formation”; aliases include “Tropic Lightning”; part of I Corps; headquarters Schofield Barracks (verified this session) (Wikidata — Q217777)
DBpedia	25th Infantry Division (United States) — resource verified on the data endpoint this session; redirects include “Tropic Lightning” and “US 25th Infantry Division”
ProductOntology	N/A
Wiktionary	lightning — noun, “a flash of light produced by short-duration, high-voltage discharge of electricity” — the word behind the division’s “Tropic Lightning” nickname (headword verified this session) (Wiktionary — lightning)
Library of Congress Subject Headings (LCSH)	N/A — id.loc.gov unreachable this session (HTTP 403)
MeSH	N/A
NCBI Taxonomy	N/A
AGROVOC	N/A
Google Scholar	25th Infantry Division Tropic Lightning Schofield Barracks Hawaiian Division 161st 27th 35th Infantry Guadalcanal Kokumbona Mount Austen New Georgia Munda Vella Lavella Luzon San Fabian Balete Pass Route 5 Mullins Okamoto 10th Division Dalton II Santa Fe Imugan Korea Pusan Nevada Complex Vietnam Cu Chi Salaknib
ConceptNet	N/A — ConceptNet API unreachable this session (HTTP 502)
OpenCyc	N/A

Also Known As

Tropic Lightning — the standard nickname, from the division’s rapid campaigns
Tropic Lightning Division
25th Division — the wartime styling
Electric Strawberry — soldiers’ slang for the taro-leaf patch
America’s Pacific Division — the division’s motto styling in its current posture

Examples and Analogies

A Hawaiian division split in two: the 25th is one of the two daughters of the pre-war Hawaiian Division — its Regular regiments redistributed in October 1941 so that Hawaii garrisoned two triangular divisions rather than one square one; the activation eight weeks before Pearl Harbor put the new division under fire within the year. (Wikipedia — 25th Infantry Division)
Three regiments from three origins: the 27th and 35th from the Regular Army Hawaiian Division, the 298th from the Hawaii National Guard, the 161st from the Washington National Guard — a composite that fought as one division through three campaigns. (Wikipedia — 25th Infantry Division)
The general the pass is named for: James Dalton II commanded the 161st through Guadalcanal, New Georgia, and Luzon, was promoted to brigadier general as the division’s assistant commander, and was killed by a Japanese sniper on 16 May 1945 — “The pass where Dalton died was renamed in his honor” as Dalton Pass. (Wikipedia — James Dalton II)
Verified division data:
Activation: constituted 26 August 1941; activated 1 October 1941, Schofield Barracks; 161st Infantry joined 3 August 1942 (Wikipedia — 25th Infantry Division)
Commanders (World War II): Maj. Gen. Maxwell Murray, Maj. Gen. J. Lawton Collins, Maj. Gen. Charles L. Mullins, Jr. (1943–48) (Wikipedia — 25th Infantry Division)
Guadalcanal: elements landed 17 December 1942; combat 10 January 1943; Kokumbona and the Mount Austen pocket; organized resistance on the island ended 5 February 1943 (Wikipedia — 25th Infantry Division)
New Georgia: Munda from 21 July 1943; Vella Lavella 15 August–15 September; Bairoko Harbor; Arundel cleared 24 September; Kolombangara and Vila airfield 6 October (Wikipedia — 25th Infantry Division)
Luzon: San Fabian-area landing 11 January 1945; Binalonan 17 January; Umingan, Lupao, San Jose; the Balete Pass drive 21 February–31 May 1945 — Digdig 3 March, Putlan 8 March, Lone Tree Hill 25 April, the pass secure 13 May, Santa Fe 27 May, link-up 29 May, relieved 30 June, Tarlac 1 July; occupation duty in Japan from 20 September 1945 (Wikipedia — 25th Infantry Division, CMH — The Bambang Front II)
World War II ledger: 5,432 battle casualties — 1,236 killed, 4,190 wounded, 4 missing, 2 prisoners (Wikipedia — 25th Infantry Division)
Korea: deployed from Japan 5–18 July 1950 under Maj. Gen. William B. Kean; Pusan Perimeter defense and breakout; the 1951 drive to the Iron Triangle; the Nevada Complex battles before the 27 July 1953 armistice (Wikipedia — 25th Infantry Division)
Vietnam: 3rd Brigade deployed December 1965; division headquarters at Cu Chi, January 1966–February 1970; Attleboro, Cedar Falls, Junction City; Tet defense of Saigon; the Cambodian incursion of 1970 (Wikipedia — 25th Infantry Division)

Usage Scenarios

1. Working the Bambang Front Order of Battle

The division fixes the western half of I Corps’ Bambang front of February–May 1945: the 25th up Route 5 against the 10th Division at Balete Pass while the 32nd fought the 2nd Tank Division at Salacsac Pass on the Villa Verde Trail — the structure this wiki’s Balete Pass, Villa Verde Trail, and 32nd Division entries carry, with Mullins’s regiments the 27th (Col. Philip F. Lindeman), 35th, and 161st Infantry, reinforced from 2 May by the 148th Infantry (37th Division) and on 24 May by the 126th Infantry (32nd Division). (CMH — The Bambang Front II, CMH — The Bambang Front I)

2. Studying the Solomons Campaign

The division’s Guadalcanal relief of the Marines and the New Georgia campaign — Munda, Vella Lavella, Bairoko, Arundel, Kolombangara — make it a standard unit for tracing the Solomons ladder from August 1942 to October 1943. (Wikipedia — 25th Infantry Division)

3. Comparing Division Service Across Three Wars

The 25th is one of the few Army divisions with major combat in the Pacific (1942–45), Korea (1950–53), and Vietnam (1965–71) — a through-line for studying the division’s change from triangular infantry to light division. (Wikipedia — 25th Infantry Division)

4. Philippine Engagement Today

The division’s current Philippine connection runs through Exercise Salaknib: in May 2026 the 25th Infantry Division and multinational allies launched the Joint Pacific Multinational Readiness Center-Exportable (JPMRC-X) at Fort Magsaysay, Nueva Ecija, with the Philippine Army’s 7th Infantry Division and partners from Australia, New Zealand, and Japan — a combat-training rotation in archipelagic terrain. (U.S. Army — JPMRC-X in the Philippines)

Strategies

Run two axes at one valley: the I Corps design sent the 32nd up the Villa Verde Trail and the 25th up Route 5 against the same Bambang Branch, each division threatening the defenders of the other’s axis — the plan that made Santa Fe, between them, the decisive objective. (CMH — The Bambang Front I)
Infiltrate when the front will not break: when frontal attacks stalled in April 1945, the 27th Infantry “slipped through a gap” in the Japanese positions to take Lone Tree Hill by 25 April — the penetration that unhinged the Myoko Ridge line. (CMH — The Bambang Front II)
Reinforce success from everywhere: with Baguio fallen, the 148th Infantry arrived on 2 May and the 126th Infantry was trucked to Balete Pass on 24 May — fresh regiments for the final drive from sister divisions. (CMH — The Bambang Front II)
Speed as identity: from the Guadalcanal pursuit to the Central Plain dash of January 1945, the division’s method was rapid movement — the record behind the Tropic Lightning name. (Wikipedia — 25th Infantry Division)
Train for the theater: the division’s 2014 opening of the Jungle Operations Training Center in Hawaii — the Army’s first jungle school since Panama — and its Salaknib rotations orient it to Pacific archipelagic warfare. (Wikipedia — 25th Infantry Division, U.S. Army — JPMRC-X in the Philippines)

Security and Safety Measures

The terrain as antagonist: the Balete drive was ridge-to-ridge above a 3,000-foot summit road — Norton’s Knob, Myoko Ridge, Woody Hill, The Pimple, The Wart, Wolfhound and Haruna Ridges — positions whose names the official history records as Japanese in origin; movement and supply were safety problems before combat began. (CMH — The Bambang Front II)
The cost of the assistant commander: Brig. Gen. James Dalton II, killed by a sniper on 16 May 1945, was one of only eleven U.S. general officers killed in action in the war — the division’s highest individual loss on Luzon. (Wikipedia — James Dalton II)
Ledger discipline: the official history counts the drive to the pass (21 February–13 May) at 545 killed and 1,650 wounded, its Table 8 for the whole Santa Fe drive at 1,510 killed and 4,250 wounded, and the standard battle account 685 killed and 2,090 wounded over the full span — each tally to be cited with its carrier and dates. (CMH — The Bambang Front II, Wikipedia — Dalton Pass)
For researchers: date each act precisely — “the pass fell” can mean 13 May (secure), 27 May (Santa Fe), 29 May (the Imugan link-up), or 31 May (campaign’s end) — and keep the 25th’s Balete record apart from the 32nd’s Salacsac record, as this wiki’s Balete Pass entry counsels. (CMH — The Bambang Front II, Wikipedia — 25th Infantry Division)

Historical Context

The division was born of the Army’s 1941 reorganization of the Hawaii garrison, activated at Schofield Barracks on 1 October 1941 and thrown into war eleven weeks later. Its first campaign was Guadalcanal — the December 1942 relief of Marine units, the Mount Austen pocket and Kokumbona, organized resistance ended by 5 February 1943 — followed by the rapid movements across New Georgia’s battlefields in mid-1943 that gave the Tropic Lightning name, and retraining in New Zealand and New Caledonia. (Wikipedia — 25th Infantry Division)

Luzon was its Philippine culmination. Landing in the San Fabian area on 11 January 1945, it raced across the Central Plain to San Jose before I Corps turned it onto Route 5 on 21 February for the three-month drive through Digdig, Puncan, and Putlan, the ridge fights of March and April, the Lone Tree Hill penetration of 25 April, and the final drive that cleared the pass by 13 May. Beyond the fallen pass Dalton was killed on 16 May; Santa Fe fell on the 27th, the 32nd Division link-up came near Imugan on the 29th, and by 31 May the Cagayan Valley stood open — the campaign this wiki’s Balete Pass and Villa Verde Trail entries document from both axes. (Wikipedia — 25th Infantry Division, CMH — The Bambang Front II, Wikipedia — Dalton Pass) After mopping-up to 30 June the division sailed on 20 September 1945 for occupation duty in Japan. (Wikipedia — 25th Infantry Division)

The Cold War kept the number in the Pacific: Korea from July 1950 to the 1953 armistice, then Vietnam from December 1965, home by 1971. Redesignated a light infantry division in 1986, the division has since deployed to Iraq and Afghanistan, opened the Army’s jungle school in 2014, and now anchors Pacific readiness from Schofield Barracks under I Corps — the posture its 2026 Salaknib rotation in Nueva Ecija displays. (Wikipedia — 25th Infantry Division, U.S. Army — JPMRC-X in the Philippines)

Challenges and Controversies

Balete or Dalton, 13 May or 31 May

The pass the division took carries two names — Balete, the wartime name, and Dalton, the 1945 renaming — and several dates: Route 5 was declared secure through the pass on 13 May, the standard account dates the battle’s span to 21 February–31 May, and one rendering has “the Americans took the Balete area on 31 May 1945.” Citations should name the act they date, as this wiki’s Balete Pass entry polices. (Wikipedia — Dalton Pass, CMH — The Bambang Front II)

Which Pass, Which Division

Popular accounts attach the 25th to the wrong pass: Balete Pass on Route 5 was the 25th’s battle against Okamoto’s 10th Division, while Salacsac Pass on the Villa Verde Trail was the 32nd’s against the 2nd Tank Division — only the 126th Infantry, attached on 24 May, fought on both maps. Accounts crediting the 25th with Salacsac, or with Bougainville — where its Solomons neighbors the 37th and Americal fought and the 25th did not — have crossed the corridors. (CMH — The Bambang Front II, Wikipedia — 25th Infantry Division)

The Ledger Varies

The official history’s 545 killed and 1,650 wounded through 13 May, its Table 8’s 1,510 and 4,250 for the whole Santa Fe drive, and the standard account’s 685 and 2,090 across the full battle all describe the same fight against 7,750 Japanese dead at Balete — variances of carrier and cut-off date, not of event. (CMH — The Bambang Front II, Wikipedia — Dalton Pass)

Division or Patch: Identity Since 1941

The division has been reorganized repeatedly — the 1960, 2005, and 2010 headquarters redesignations, the 2022 reflagging of its Alaska brigades as the 11th Airborne Division — so references to “the 25th” attach different formations in different eras; the current division at Schofield Barracks is the two-brigade Pacific division of the Salaknib era. (Wikipedia — 25th Infantry Division)