1: Is it me but do first time players use up there weapons and cant find on the battlefield a common among first timers? yes you'll run out of ammo even if you're a pro.
2: In the campaign I've gotten to the point just past the sequence about the core and tele-ported to somewhere close and as Cortana says hoof it a little I've come across this flying object that I can't seem to bring down the only description I have is that it has what appears to have eye's attached to it do I aim for the middle or do I aim for the eye's to bring it down? aim for the eye if your talking about a watcher
3: the aircraft use's a shield to protect some kind of soldier and I keep running out of ammo trying to kill it what's up with that? kill the "watcher" then kill the target.
if you have any other questions hit me up