My Dad fought on Okinawa, and was in the 96th Infantry Division...that would be ARMY. Some seem to think only the Marines were on Okinawa.
They hit the beach on April 1st, which was also Easter Sunday. They met little to no resistance, when they hit the beach, he told me. He said infantrymen can be very superstitious, so landing on April fool's day, and it also being Easter Sunday, and not encountering much resistance, made them extra wary.
The Marines moved north, and the Army moved south. The bulk of the Japanese army was south, so guess who ran into them?