I have an Uncle who was there on the line the night the Chinese came into the war. He was carrying a M3 grease gun. During his career in the Marine Corps he was in the first wave at Iwo Jima, on the line at the Chosin Reservoir, and was at Chu Lai for Tet. I asked him the same question. He thought about it for a while and said that his M3 worked well; but a whole bunch of Claymore mines would have come in real handy.