Short answer, They cant...

Crashpads as commuters, cost around the 350 ish range iv seen. Some move here and get a real apartment with roomates. Still insanely expense near LAX. Further inland, not horrible.. But the drive can get lengthy with traffic.
Some local guys/gals that already lived here may/may not be living at home. So I don't know what the natives are doing. But by my financial planning Id say with full confidence, first year fo pay and no other source of income makes it impossible to live in base without a roomate, and/or a crappy apartment. You wont be putting anything in savings, thats for sure.