I'm gonna use this as an error report thread for the USMC OOB in order to not start a new thread just for this one thing.
Unit 099 Dragon Fire, weapon 3 (Weapon 008 M16 Rifle) has the same ammo loadout (48 HE and 12 AP) as the EFSS mortars. Looks like a typo error. I've switched it to 60 HE and 0 AP in my OOB.
The numbers are defined in terms of "basics" for ground units in the Mobhack help file, but are flexible to a point. After 40 the system is treated as Thermal/IR, after 50 its treated as Ground Search Radar (GSR).