I can't speak for the Germans, but can for USN. Captain Eugene Fluchey was a wild one, and aways thinking ahead, and late (LATE) in the war he begged and plotted for rockets. He got them (1st and an expriment) and they assaulted a Japanese island. But this was like March or May 1945. I'm not saying no one was ealrier, but the whole concept was quite new and intriguing. I would definitely be interested in any info you have! (I know tanks were using rockets much, much earlier, but..). I have seen footage of tanks firing rockets, and maybe some ships, could be bad brain. It would be very interesting if KM was earlier. It's also interesting to see the imbalance...KM never thought they were detected with radio transmission, and their radar was laughable. Turns out the radio was a homing beacon, and eventually their radar. They seemed to have a pretty good submarine system, yet lacked in other areas fascinating!