Talk:Engineer/@comment-108.221.204.53-20121024204838/@comment-99.59.108.17-20121203175150

They increase the duration the pack stays on the field. I think, with the exception of the first one or two levels, they also increase the range they can resupply.

I believe it only upgrades the utility slot ammo pack. The one from the ace turret comes at 4 minutes and 5 meters I think by default and never changes. Someone please correct me if I'm wrong. I have no idea if this is a bug or intended.

Anyway, I'd put your certs to improve your engi in repair long before you do ammo. Even then, if you mostly use explosives in that slot, don't bother. If you're like me, and tend to run double ammo, then at least put in a couple levels at some point and maybe finish it much later if you really want it.

I'm not sure if it was a glitch, but back at the end of beta, when I had it fully certed, the final level ammo pack dropped two next to each other. Supposedly it refills twice as fast, letting you resupply one guy faster or more people at once.