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United States' Squadron and Group Codes, 500-599

Code Squadron Group Air Force Notes Aircraft
D71 503rd FS1 339th FG1 8th1    
6N1 504th FS1 339th FG1 8th1    
5Q1 505th FS1 339th FG1 8th1    
GJ1 506th BS1 44th BG1 8th1    
4K1 506th FS1 404th FG1 9th1    
Y81 507th FS1 404th FG1 9th1    
YB1 508th BS1 351st BG1 8th1    
7J1 508th FS1 404th FG1 9th1    
RQ1 509th BS1 351st BG1 8th1    
G91 509th FS1 405th FG1 9th1    
2Z1 510th FS1 405th FG1 9th1    
DS1 511th BS1 351st BG1 8th1    
K41 511th FS1 405th FG1 9th1    
  VMF-5113     USS Block Island3 F6F-5N3
  512th BS6 376 BG6 9th6   B-246
L31 512th FS1 406th FG1 9th1    
  513th BS6 376 BG6 9th6   B-246
4P1 513th FS1 406th FG1 9th1    
  514th BS6 376 BG6 9th6   B-246
O71 514th FS1 406th FG1 9th1    
  515th BS6 376 BG6 9th6   B-246
WA1 524th BS1 379th BG1 8th1    
FR1 525th BS1 379th BG1 8th1    
LF1 526th BS1 379th BG1 8th1    
FO1 527th BS1 379th BG1 8th1    
  VMF(N)-5313     Banika Island3, Solomon Islands3 PV-1N Ventura3
VE1 532nd BS1 381st BG1 8th1    
  VMF(N)-5323     Engebi Island, Eniwetok3 F4U-23
AN1 533rd BS1 386th BG1 9th1    
  VMF(N)-5333     Ie Shima, Okinawa3 Hellcat3
VP1 533rd BS1 381st BG1 8th1    
  VMF(N)-5343     Guam3  
GD1 534th BS1 381st BG1 8th1    
MS1 535th BS1 381st BG1 8th1    
  VMF(N)-5413        
  VMF(N)-5423     Yontan, Okinawa3 F6F-5N3
  VMF(N)-5433,5       Hellcat5
SU1 544th BS1 384th BG1 8th1    
JD1 545th BS1 384th BG1 8th1    
BK1 546th BS1 381st BG1 8th1    
SO1 547th BS1 381st BG1 8th1    
  547th NFS4     Pacific4
Kills: 64
P-614
GX1 548th BS1 385th BG1 8th1    
  548th NFS3,4     Ie Shima, Okinawa3; Pacific4 P-61B3,4
XA1 549th BS1 385th BG1 8th1    
  549th NFS4     Pacific4
Kills: 1 4
P-614
SG1 550th BS1 385th BG1 8th1    
  550th NFS4       P-614
HR1 551st BS1 385th BG1 8th1    
DQ1 551st FS1 495th FG1 8th1    
RG1 552nd BS1 386th BG1 8th1    
RG1 552nd BS1 386th BG1 9th1    
VM1 552nd FS1 495th FG1 8th1    
AN1 553rd BS1 386th BG1 8th1    
RU1 554th BS1 386th BG1 9th1    
RU1 554th BS1 386th BG1 8th1    
B91 554th FS1 496th FG1 8th1    
YA1 555th BS1 386th BG1 8th1    
YA1 555th BS1 386th BG1 9th1    
C71 555th FS1 496th FG1 8th1    
FW1 556th BS1 387th BG1 8th1    
FW1 556th BS1 387th BG1 9th1    
KS1 557th BS1 387th BG1 8th1    
KS1 557th BS1 387th BG1 9th1    
KX1 558th BS1 387th BG1 8th1    
KX1 558th BS1 387th BG1 9th1    
TQ1 559th BS1 387th BG1 9th1    
TQ1 559th BS1 387th BG1 8th1    
YO1 564th BS1 389th BG1 8th1    
EE1 565th BS1 389th BG1 8th1    
RR1 566th BS1 389th BG1 8th1    
HP1 567th BS1 389th BG1 8th1    
P21 572nd BS1 391st BG1 9th1    
T61 573rd BS1 391st BG1 9th1    
4L1 574th BS1 391st BG1 9th1    
O81 575th BS1 391st BG1 9th1    
CI1 576th BS1 392nd BG1 8th1    
DC1 577th BS1 392nd BG1 8th1    
GC1 578th BS1 392nd BG1 8th1    
EC1 578th BS1 392nd BG1 8th1    
K51 584th BS1 394th BG1 9th1    
4T1 585th BS1 394th BG1 9th1    
H91 586th FS1 394th FG1 9th1    
5W1 587th BS1 349th BG1 9th1    
X21 596th BS1 397th BG1 9th1    
9F1 597th BS1 397th TCG1 9th1    
U21 598th BS1 397th BG1 9th1    
6B1 599th BS1 397th BG1 9th1    
  • BG: Bomber Group
  • BS: Bomber Squadron
  • FG: Fighter Group
  • FS: Fighter Squadron
  • NF: Night Fighter
  • NFS: Night Fighter Squadron
  • OTU: Operational Training Unit
  • PG: Pathfinder Group
  • PS: Pathfinder Squadron
  • RG: Reconnaissance Group
  • RS: Reconnaissance Squadron
  • TCG: Troop Carrier Group
  • TCS: Troop Carrier Squadron
  • TRG: Training Group
  • TRS: Training Squadron
  • VF(N): Navy Night Fighter Squadron
  • VMF(N): Marine Corps Night Fighter Squadron

Sources:

  1. USAAF Handbook 1939 - 1945, Martin W. Bowman, 1997
  2. Mosquito Photo-Reconnaissance Units of World War 2, Martin Bowman, 1999
  3. American Nightfighter Aces of World War 2, Andrew Thomas, Warren Thompson, 2008
  4. P-61 Black Widow Units of World War 2, Warren Thompson, 2000
  5. SBD Dauntless Units of World War 2, Barrett Tillman, 1998
  6. The North African Air Campaign, Christopher Rein, 2012
20th Century American Military History Crucial Site