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I got out of the USMC in 07 and climate/pressure controlled boxed were used and then reused for all kinds of stuff. Most of the ones I dealt with contained rockets or demo. The APOBS (Anti-Personnel Obstacle Breaching System) always came in a fancy box, but much smaller than that. I'm inclined to say that your box housed some sort of rockets or maybe missiles especially because of the "Inert" designation. The triangular pieces in the center stopped whatever gear the box was designed for from rolling around. Probably practice rounds (hence the "Inert") were stored in here after the real boys were shot off. Every type of ordinance used in the military has an inert counterpart that is used in training. Judging by the size of that box, whatever was in there was nice and big. BOOM
Mystery solved!
Found the original military shipping container label.