little bit about the military (fwiw).. my hubby was a recruiting commander for three years...
There is a delayed entry program for all branches of the service to include the NG, and the Reserves of all branches. The paperwork is signed...an agreement with the recruit for delayed entry into the service. Basic training is than done ((usually)) in the summer between the junior and senior years. Drill is done on weekends in between (or if active duty there is intermittant training that is done thru the recruiting office). After graduation you are swore in officially and attend AIT (advanced individual training) in your specialty area and your career continues.
HOWEVER
It is also possible for those 17 years of age with the signature of a parent and a GED to do the same type program.. They must be 17 at the time of AIT at a minimum... In other words, a kid could sign up with parental signature for delayed entry, and after successful completion of the GED be sworn in and attend AIT.
Did DG graduate from a HS? Just wondering...
As for the other military question about weight limits... yes they SURE do exist (to the woe of many LOL).. They are based on your sex and your age (as do the requirements of the PT test).
As for what would make a soldier nondeployable... I would not think that weight would be a black liner on a NG soldier. There are MANY, MANY, MANY steps that a unit goes thru predeployment and many boxes to check off on each and every soldier to ensure they they are a "go". For those with a PT test failure or over weight, they would simply deploy with appropriate "profile" in their packet and remial PT, weight plan would be assigned to them to be followed. However, something such as an injury or even a mental incapacitation could keep a soldier back.. as could extenuating family circumstances (usually VERY hard to obtain). Trust me, before a soldier deploys they are checked down to each and every tooth! (yes! I have seen units jump through hoops to get a soldier a go on his dental check hours before the bus came to pick up the unit!).. Hope this helps