In the Spring of 1943 the US sent to the USSR, via the Lend-Lease Program, tens of tons of nuclear materials - including enriched uranium. [See Richard Rhodes, Dark Sun, Chapter Five, "Super Lend-Lease"].
The head of the Lend-Lease Program at that time was Harry "The Hop" Hopkins - FDR's alter ego. Hopkins is now known from the VENONA Project to have been Soviet "Agent No. 19."
N.B., The TRINITY TEST at Alamogordo, NM was in the Summer of 1945.
Affirmative- she was a WAC Master Sarge in Caspar, Wyoming, and a truck wreck that caused her to forget how to feed herself or walk ( head injury ) kept her from shipping out with the Platoon she commanded to Europe... they moved her over to intelligence after rehab.
She went to her grave saying "I know things I can't tell you about..." Her oath was good to the end.
All moms are in Intelligence!
(Shameless, gratuitous plug for my darling wife and mother of my children .. blessed of the Lord and a member of the vast, and growing, branch of the Stay-at-home, homeschooling, rightly dividing the word of truth conspiracy.)