“few to choose”
T69 MGMC (4x .50s, greyhound chassis)
T77E1 MGMC (6x .50s, chaffee chassis)
T100 MGMC (4x .60s, walker bulldog chassis, radar)
T52 MGMC (Sherman with 1x 40mm and 2x .50cal in ball turret)
M2 Halftrack [Elco Thunderbolt] (4x 20mm+ 2x .50 on M2 Halftrack)
M114A2 (M114 hull with Hispano-Suiza 20mm, similar to other 5.3 Hispano 20mm AA in Japan and France)
M113A1 HS.820 (M113 with 3x Hispano-Suiza 20mm)
M19 [M51 Skysweeper] (75mm Skysweeper autoloaded gun on M19 chassis, HE-VT)
RADUSTER (Duster with radar)
T249 Vigilante (37mm rotary cannon)
XM246 (35mm KDAs on Patton chassis much closer together than Gepards, more effective than M247 “Sergeant York” in trials)
AN/TWQ-1 Avenger (4-8x stingers + .50 cal on Humvee)
GLAADS (2x 25mm Bushmaster, thermals, on Bradley chassis)
LAV Blazer (LAV-AD with 4x Mistral, and radar)
Centurion C-RAM (Phalanx CIWS on HEMTT)
M-SHORAD (30mm non-rotary autocannon, 4x Stinger missiles, 2x AGM-114L(possibly better?))
Avenger II (1x 25mm Gast gun, 4x stingers, thermals on a Humvee)
Bradley [Chaparral] (4x whatever missile the Chaparral has access to, much better protection)
XM1108 w/“Advanced Chapparal” (4x MIM-72 + 2x Hydra pods or 2x AGM-114, or 6x MIM-72)
And that’s not even every SPAA they could add lol