Pony, global upgrades that provide you with 10-12 grenades for 30mu seems a bit more than intended!
I'm pretty sure it's 'global' only in a sense that if one squad uses up the uses, it's gone. You don't get 'new' grenades on every FJ squad. (So you really only get 2 uses of those grenades, worth the 30 Munitions in total) Would have to double check though.