in may 1944, general donovan, the head of the oss, divided the unit into groups. he loaned group 1, under lieutenant arthur choate, jr., to admiral nimitz, as a way to introduce the oss into the pacific theater. they became part of udt-10 in july 1944, with lt. commander choate commanding the unit. five oss men participated in the very first udt submarine operation with the in the caroline islands in august 1944.