It seems, my grandfather also was on the 421 Rocket Battalion. Grandpa was a corporal in the Army from 1943 to 1946. From stories I was told by my late grandfather and also a memoir written by my aunt of his Army life, I believe grandpa was in the 1st Rocket Battalion and completed his training at Fort Sills in Oklahoma. Grandpa left for Okinawa from Seattle Washington aboard the USS Cape Claire. I will try to see if our grandfathers were in the same Battalion as I further my search. Any information you may provide would be very much appreciated. Thank you! Christina Dunham