Banned because you should read They Chose To Remain, by me- I just found an illustrator. You should also read Soldiering On In A Dying War by William Shkurti, a refreshingly scholarly look at the American Vietnam drawdown, and assuming that you're done with Herbert, Heinlin, Card, and Niven (Swicord can get into the specifics of them better than I ever could) I would actually suggest the HALO books: generally, product-licensed paperbacks are garbage, but I've actually found them to have strong plots, reasonably good writing, many connections between one another (they really do need to be read in order, and some of the earlier ones aren't as good), and a fair amount of moral ambiguity.