A lot of Mags have NSNs and are issued to the military.I'd guess SureFire or Streamlight since they are the only companies I know of that publishes their NSN numbers for reference. Anything/everything issued has an NSN number. This is just a guess
You'd be surprised what some agencies are still using out there. Lights kept on-board ships instead of directly issued to men, there are likely some Coast Guard ships that still have those old lights in reserve. Most likely inspected a few times a year to keep them in working order.This was about 20 years ago but I got to take part in a Canadian Coast Guard training operation. The small vessel I was on had 2 maglite 2D's mounted in the wheel house wall. There were 2 orange 2D's mounted on the wall in the engine room. Im not sure if these were made by Brightstar or by Fulton. The engineer also carried one on his belt. The 2 man dive crew was carrying Pelican Supersabers in Yellow. The deck crew had Maglites I think. Each life vest had a red personal strobe light. I think they were 1 D cell sized. But this was a long time ago.
The one I showed was a 3D for that extra brightness. There may have been mostly 2D for general use. Yes the tailcap is very similar to the MX 991, probably by spec requirements.Bykfixer that light you posted is very similar to the ones used on the boat I was on. Theirs was a little shorter but had a black plastic switch and the flat tail cap that you see on MX-991 Army Flashlight. It may have even had the extra lenses inside but I'm not sure.
Monocrom I think those lights were mounted there for an in case of emergency type situation and not daily use. It would make sense that not everyone would need a light on them at all times. I do remember everyone having those god awful rings on their belts to hold maglites and almost everyone had one on them outside of the bridge crew. The exception was those who wore coverall's. They carried the yellow lights and I assume they were because the engine room is an explosive environment. I'm not much of a boat guy so I don't know for sure. I think there were only 12 to 14 crew on that boat.
It really surprises me to think of what outdated gear some people are still using but when I guess when your on a budget you make due with what you have.