Classic move: make the kids struggle, then offer them a lifeline if they just put on a uniform. The GI bill is great, but you shouldn't have to step on an IED to go to college.
Nah... That's a cute idea but here's some actual data:
https://www.bundeswehrkarriere.de/downloads/mannschaften/936
tl;dr: Okay but it's not golden by any means.
FYI, higher education is practically free in Germany.