The recruiting pinch is very real and is getting worse.
I believe it was mentioned as one of the US Army's biggest threats, in a pentagon report not long ago,
(Right up there with global warming) 
IMO the shrinking availability of warriors our society can produce will ultimately not be able to keep up with our number needs. I see only three solutions, all aren't great.
1 - Start ramping up the service for citizenship drives, we know how that went for Rome
2 - Reinstitute the draft in some form, also not ideal.
3 - Worse yet, continue to soften the military to attract more people, that ultimately kills the fighting spirit in the ranks.
Thoughts?
S