thats a tough decision.. because Germany and japan were allied but most of the Japanese crew were sent out on planes and ships, mostly because japan specialized in technology, though i do not think they had 1 samurai in one platoon, but we will just go to it, now being realistic, German forces rarely used melee combat, though they always had daggers on the back of there rifles, nothing really special, but because of the weak armor the samurai are wearing, id say it would relatively easy to gun down 1 samurai, (though it would be pretty cool to have star wars bullet deflecting powers)
