http://www.medalofhonor.com/JamesSwett.htm
From that website link
Colonel Swett took part in action in the South Pacific from early 1943 until January 1944. After a year's duty in the United States, he returned overseas in January 1945, and participated in combat operations at Iwo Jima and Okinawa.
I haven't found an exact date of the awarding but I would guess it was sometime in that year he spent in the states, 1944.
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