The sad part is, after 15 years with no power, most things won't work if power is restored anyway. unless from the beginning they have been doing maintenance, all that military equipment will have dry rotted. It's nearly as absurd as the Harriers in Battlefield: Earth still being operational.
Ya and BE was 1000 years later too! LOL
Still Randal may have a stock pile of Military equipment stored away that will work. Keep in mind that he has electricity at his location, so maintenance can be keep up on that stuff.