He was with them (born 1937). They went first to a camp in Arkansas, then one in CA (not, IIRC, the famous Manzanar).
He went to Tule Lake after Rohwer. People who refused to sign the loyalty oath were sent there in 1943/1944.
Tule Lake's buildings were intact as late as 1969. I have a friend whose property includes what was part of the camp.