too easy xP
1. Bunker: 2x Power Shield (->100% protection) + 1x Time Delay (+any weapon at the beginning)
2. and 3. Bunker: 5x Air Support
(every item fully upgraded)
as soon as you have the 2 power shields you can't be killed, unless it happens in the first 10 sec.
Where do you need the f***ing multitasking?! xD