I don't think that NASA's reasoning that the 2 fully load .45s would be useful as a possible means of propulsion. How? Carrying a .45 for propulsion might make some idiotic sense in weightless conditions but not on the Moon. The recoil simply is not enough to lift a man off the ground even on the Moon. This reasoning is absurd.
Several other choices are just as bad... leaving behind the flashlight and the heating units sounds reasonable... but there are SHADOWS that are extremely dark and cold. I did put the heating units low... but a bright flashlight might come in handy. I put the firearms dead last.
The First Aid Kit is a "gotcha"... only on the answer page do you find out that the First Aid Kit has needles that are designed to penetrate special access ports on the spacesuit. Otherwise, a First Aid Kit would be not useful as you could not access wounds without opening the spacesuit... which would result in a dead astronaut. Had they mentioned that little needle detail, I would have put it a bit higher on my priority list.