The Lend-Lease policy was a program following which the U.S. provided the U.K., the Republic of China and Free France and later the Soviet Union and different Allied nations with good, oil and food in the years between 1941 to August 1945.
This incorporated frigates and warplanes, simultaneously with other ammunition. In general sense, the aid and assistance were free though some equipment (for instance ships) were reinstated following the war.
