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War Department casualties include the US Air Force, which was part of the US Army during WWII.
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WWII US Army Casualties

WWIIUSArmyCasualties.docx, 21 Nov 2023

Source: https://apps.dtic.mil/sti/pdfs/ADA438106.pdf, p. 5

Description

Battle Casualties

 

     1 - Killed in Action (KIA)

189,696

 

     2 - Wounded & Injured in Action (WIA)

592,170

 

       2a - Died of Wounds/Injuries overseas, DOW

 

26,225

       2b - Died of Wounds/Injuries in the US, DOW

 

84

       2c - Returned to duty overseas, 383,196

 

 

       2d - Resumed duty in US/discharged, 182,665

 

 

     3 - Captured or interned (POW)

124,079

 

       3a - KIA while a POW

 

3,102

       3b - DOW while a POW

 

453

       3c - Died of other causes while a POW, 9,098

 

 

       3d - Returned to US military control, 111,426

 

 

     4 - Missing in Action (MIA)

30,314

 

       4a - Declared dead

 

6,058

       4b - Died of other causes while MIA, 158

 

 

       4c - Returned to duty – 24,098

 

 

     Total WWII US Army Battle Casualties

936,259

 

 

Battle Casualty Deaths

     Initially Killed in Action – line 1

189,696

 

     WIA - DOW overseas – line 2a

26,225

 

     WIA - DOW in the US – line 2b

84

 

     POW - Killed in Action – line 3a

3,102

 

     POW – DOW – line 3b

453

 

     MIA - declared dead – line 4a

6,058

 

     POW – died of other causes – line 3c

9,098

 

     MIA – died of other causes – line 4b

158

 

     Total WWII US Army Battle Casualty Deaths

234,874

 

 

Commentary on the above table:
  • Line 3a, Killed in Action while a Prisoner of War - most of these deaths were caused by US submarine or aircraft attacks on unmarked Japanese ships -- the so-called Hell Ships -- carrying US and Allied prisoners of war.
  • Line 3c, Died of Other causes while a Prisoner of War - most of these deaths were due to grim conditions in Japanese Prisoner of War camps in the Philippine Islands.