Well, concerning engines-
My Dad's last command was the ARADMAC (Army Aeronautical Depot Maintenance Center) in Corpus Christi, TX. It wasn't really "maintenance" as this facility could completely re-build or overhaul a complete fixed-wing or helicopter, including engines and airframes. Twelve hundred people worked there, mostly civilians. This is my Dad (left) showing a newly- rebuilt radial engine to another officer. I suspect the engine is from a Dehavilland Beaver (?). He retired in 1962.