A reference to those in administrative duties. More specifically those who completed ranger school and got thier ranger tab just so they could go back and push a pencil for more money.
Tom> That guy in ranger school, Jimmy, did he go 3/75 ?
Sam> Yea but he's a damn chairborne over in admin., Pushin a damn pencil!
(Jimmy comes walking by)
Tom> Hey Jimmy, Chairborne Ranger All The Way!
Jimmy> Hey fuck off.