I just walked out side and saw this overhead:
That’s a Douglas C-53 Skytrooper.
Basically a C-47 optimized for carrying troops, with cargo handling facilities removed, Douglas built 380 for service with the Army Air Forces. Because the C-47 could perform its role as well, production was shifted to the basic C-47. The C-47 was the primary troop carrier for paratroops during World War II.
How can I tell the plane I saw overhead was a C-53 and not just a C-47?
I cheated. I’ve seen that particular plane at several airshows. One of the nice things about where I live is the proximity to a very nice collection of warbirds. I see quite a few of them flying by from time to time.