Having done something similar a couple times, I question whether you have 4wd also. You can get the right side stub shaft sitting on the edge of the differential output, then when pushed up in place it binds and will not go in.
Put up on jack stands. Then with emergency on, tranny in 1st gear, 4WD Lo try turning right CV joint by hand and shoving it into differential. If it does not go in when turning CV joint by hand, Then remove left side CV joint from axle, loosen both sides differential mounting bolts, remove the rear mounting bolt (allowing the differential housing to shift a little), and try again to turn and reposition Stub shaft into differential.
Frequently when you have jammed the axle in an offset position you deform the seal and the only solution for that is replacement. Then you have to remove differential, remove/re[;ace seal and reinstall it (being a little more careful).
And yes even a marine could perform this repair. They even used to (a long time ago) have a hobby garage at the bases, with tools. My feeling was Va. never cared much for service personnel (back a long time ago), so I hope you the best of luck.