Im unfamiliar with what the USAF Utility mod is. However these are available in the pylon loadout of the USAF mq9 reaper drone by default. Most modded aircrafts use their own pylon classes, making it impossible for me to make this ammo type available for them all. I posted solution to this in the description of the mod, with it having to be done through that script chunk.

The 4x pylons will be coming soon!