Check it
Just check it all, except the documents. If you’re on orders there is no problem at all with TA-50, including NVG's and firearms. I would make sure to document everything I checked, maybe a photo or two. I have traveled on civil carriers (both US and foreign airlines) back and forth from the States to down range several times WITH my M9 (or two), magazines (unloaded), knife, TA-50 equipment ... ect. As long as the bags are locked, (you may have to show the contents then lock it back) you’re fine. As long as you took due diligence to protect what your signed for, (by checking and locking the bag) you are covered. Only take through security what you really need on the plane. Keep it simple, if you try to take these things through security your just asking for problems. You may then have to go back and put it in one of your checked bags, (after it is found) and might miss the flight.