>>18945600 lb
A Corp of Engineers Officer
During the mobilization period for World War II, from 1940 to 1942, Groves eventually oversaw all army construction in the United States, a mammoth task involving building camps, munitions plants, airfields, depots, and the Pentagon to support an army that grew from 135,000 during the interwar period to an eventual 8,000,000 during World War II.
https://iowaculture.gov/sites/default/files/primary-sources/images/history-education-pss-WWII-groves-source.jpg