The easiest way to get perfect gunner = grab a machine gun, shoot one shot and dont miss, then drop it and never pick up a machine gun again.
When the military shows up, go see Isabella the first time, then spend the remaining time before you talk to her again in the warehouse killing Spec Ops. Just use Adam's mini chainsaws, Cliff's machete, or Larry's meat cleaver(2 hits per guy) and grab two of the "3x longer for blade/edged weapons" books so your items last way longer(apparently the book stats STACK).
You should gain a good 10 levels if you're efficient at killing them without losing much health(I ended 72hour mode at level 32) and still have plenty of time to get ending "A"
btw:have fun fighting Brock on his TANK in Overtime mode
XBL Gamertag = XMrWhitefolksX
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