New GI 6mmARC mag Search

[Lemonaid]

These could be sourced through Crane Naval Surface Warfare Center in Southern Indiana. Crane procures a lot of equipment and performs testing for the Special Operations community (SOCOM). It is very common for different branches of the military to provide resources to different units across the military. At one time all K9 dogs and explosive detection training was completed in Florida for all of DoD. A lot of joint bases these days.

Sounds like you have a better bead on this than me. So much for the simple answer.