Actually, I would love to see the military offer up blue collar training in the last 3-6 months of a tour esp. when the MOS is something like Gunnery. 
I think that 6 months of teaching construction by rebuilding new barracks on-base would be useful. Heck, we might even teach this over seas esp at any ephemeral bases. 
Or how about adding some chef schooling even at oversea bases. Heck, they could have an average mess hall, and then each day / week, they have 1/6 of the ppl eat at a special mess where decent cooking is done. 
And yes, that means a better kitchen, better ingredients, etc. And yes, a bit more money, but I think it would be worth it for the troops and for those that want to learn how to be a chef. Once stateside, in the last 3 months, they work on better dishes.