Yeah, only the officers were allowed to have swords--not that the average PFC would want to carry around a big samurai sword through the jungle!
Funny story. Pastor K., a good friend, had an uncle who had been a samurai and still had the sword. (Swords are very much regulated nowadays.) He used to get drunk, get his sword, and run through the house waving it around. The family would all have to run and hide. The the oldest son was allowed to take it with him to fight in WW2. Fighting in the war, he lost it somewhere, and the whole family breathed a sigh of relief!
By the way, on a preaching trip to Okinawa years ago we were taken on a tour of the Japanese WW2 base in the tunnels, and were shown the room where the generals, or at least one of them, committed suicide.