A school buddy (K, elem, HS) helped design the spent case recovery system which is actually just a system to stuff them into plastic links, I believe the same ones the ammo comes loaded on. ( He is one of them there Rambling Wreck Injun Ears) As a former Light weapons Infantryman I was concerned about 30mm shell cases falling and doing 300mph, so I was glad to hear of it. I knew a WWII Navy pilot ( another buddy's dad) that said Marines loved close air support EXEPT when it the aircraft over flew their positions while firing .50s. Another WWII vet claimed his unit on the ground took casualties from falling .50 cases. Having looked at the dummies in question I will say I am glad that my limited experience with A-10s did not involve falling spent cases!
-kBob