CastleRock said:
Sounds like you may (validly) still be holding on to some resentment for his conduct under your supervision. However, a true leader would examine his own shortcomings.
Caveat: I'm not, never was military, and I'm not management.
That part is a cop out. Even in the civilian world, superiors can only spend so much time trying to get *adults* to do better work. Yeah, our OP (I'm guessing Colonel or higher?) could probably get this adult (I'm guessing 1Lt?) to be a better soldier. Tell him what additional steps he could take to improve, maybe drop by and give him some encouragement, that little bit of extra attention.
But he's probably got a few dozen other people that are already that motivated, or at least motivated enough so as not to cause him extra work. If I had to guess, guys like this come through every couple of years, do the minimum, and pop out. Why invest?