As described in the Design Analysis article [ HTML ], the C-47 was indeed the workhorse of the AAF. For all that, however, it was fairly poorly represented in the contemporary publications.

There is a fair amount of confusion about the DC-3 airframe in military service. The Design Analysis article lists

C-53 was called Skytrooper, and C-48, C-49 should also be so called. C-47 was called Skytrain. However, the C-47 Skytrain name was casually applied to all DC-3 airframes in the popular press. The Gooney Bird nickname, also freely popularly applied to all DC-3 airframes, appears to have originated in WWII.

Wikipedia lists a few more types

And, of course, there were the various versions of the Navy's R4D. Plus the experimental XCG-17 glider and XC-47C floatplane. Postwar there were air-sea rescue, ELINT and gunship variants. More than 75 years after first commercial flight, the basic DC-3 airframe is still in revenue service.

All of the types (except the DC-2 variants) were built on the same basic DC-3 airframe, as evolved and modified over time. This airframe has to qualify as one of the outstanding engineering achievements of all time.

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Additional information from Technical Orders
TO 1-C-47-3 Handbook, Structural Repair Instructions