"experimental 40mm grenade launcher"?
EXPERIMENTAL???
waitaminnithere... I've seen these things in action movies since at least "Predator"
they were not real until now?
or they are foreign, and only now at long last entering US issue?
Maybe since the Marines realize they'll be stuck with it for quite awhile they wanted to make sure they had everything right. Marines aren't known tolerate "Vapor-Ware Snake-Oil Salesmen" very well.