First, let me say thank you for your service to us over seas.
Now as for your routine, I think it needs to be better balanced and a reduction in over lapping exercises.
I'll keep with your scheme, but I'd like to make a few adjustments to it. Good to see you training each muscle twice a week, but i think it could use a little balancing.
First, rather than doing 3 heavy days in a row followed by 3 light, why not
Day 1: Heavy
Day 2: Light
Day 3: Heavy
Day 4: light
Day 5: heavy
Day 6: light
Day 1, select 2 chest press exercise, 1 over head press exercise (not behind neck), 1 ancillary triceps exercise. Adjust volume as needed (you may need 4-6 sets per exercise). Add in ancillary work for rotator cuff. Train your traps day 2, as they are a large muscle in the back.
Day 2: Select 1-2 pull up movements, 1 or 2 horizontal rowing movements that do not put much emphasis on lower back (seated rows, inverted rows, etc), 1 shrugging movement, 2 biceps movement. Add in extra work for rear deltoids and lower trapezius
Day 3: Squats, rumanian deadlifts, lunges, 1 calf exercise, core work.
Day 4: lighter day similar to day 1, more ancillary work: triceps, medial deltoids, rotator cuff
Day 5: 2 heavy horizontal rowing movements, 2 pull up type movements, 1-2 shrugging movement, 1 biceps movement, lower trapezius and rear delt work
Day 6: Emphasis on single leg movements (pitcher squats, split squats, single leg sldl's, etc.), core and hip abduction work
You may find as you go along that your light days need to be even lighter, with less general effort put forth, enough to keep good blood and encourage recovery...but that will all depend on your body.
I suggest starting out slow, especially if you are not accostumed to training 6 days a week. As you get in better condition, you can slowly start increasing sets and intensity. I'd also suggest a deload week every 4th or 5th week, as I've found a lot of people burn out quick with programs such as this.