To put this into context, the 82-day Battle of Okinawa lasted from early April until mid-June 1945 and U.S. casualties (10th Army, out of 5 Army and 2+ Marine Corps Divisions) were over 62,000, of which over 12,000 were killed or missing. The Imperial Japanese 32d Army, defending Okinawa, had 3 divisions, & 4 separate brigades, with 67,000+ troops, augmented by 30-40,000 local militia & patriotic organizations.
Appleman, Roy E.; James M. Burns; Russell A. Gugeler; John Stevens (2000).
Okinawa: the last battle
Washington, D.C.: United States Army Center of Military History