Passing a former machinist's mate working at a grocery counter, I
became concerned about my own prospects as a future ex-computer
systems analyst/operator (formerly 74B, now 25B).

What percentage of former 74Bs are employed right now?  What jobs, as
specifically as possible, are most of them doing?

If such information is available, it'd be really nifty to have those
statistics separated for those who got out after one term, and those
who stayed in longer; and by those with & without college degrees. 
But those would be pure bonus material.