For More Than Glory — William C. Dietz

You're only a hero...
The Legion has repelled a war that was waged against all sentient creatures. And they've gained new allies in the process: two alien races. It's up to Legion General Bill Booly to stabilize the Confederacy -- and crush the last remnants of the mutinous Legionnaires who are still in possession of dangerous armaments.

...until your next battle.
But such a veteran warrior knows that peace is just a pause between wars. Already, another rebellion is brewing on a remote world light-years away -- spawning a web of terrorism that is close enough to catch the vulnerable Confederacy in its grasp...