The U.S. Navy recently put a rebuilt C-47 originally delivered to the United States Army Air Force as 44-76511 in 1944 as a C-47 twin-engine transport. This aircraft has reentered service in the US Navy in 2021 as a range support aircraft for its ATR (Atlantic Test Range).
The navy needed a larger range support aircraft so that more radar and tracking equipment could be carried and track multiple jets and missiles they had in the air at once.
The old ATR was a King Air, twin-engine commercial turboprop transport introduced in the 1969s, three decades after the DC-3, an aircraft that was renamed the C-47 during World War II.
Replacement cost was the issue. A new King Air, or similar but larger aircraft, would not only cost a lot more than the rebuilt C-47 (as a BT-67) but would take longer to obtain. The 77 year old plane was therefore rebuilt by Basler and designated BT-67 for US Navy.
https://www.strategypage.com/htmw/ht.../20210520.aspx
https://www.scramble.nl/military-new...67-for-us-navy