I'm exploring the possibility of research leading to a book on the origin of callsigns. Perhaps two volumes would be required: one for individuals and one for units. Does anyone you know have information on when callsigns started in the Corps? I am familiar with squadron callsigns since Viet Nam and the history of most squadrons contain a "callsign legacy". But, individual callsigns are another matter. I suspect they started with the ACM crowd and were part of the brevity codes that transpired to increase efficiency during intense combat engagements. I proposed doing a couple of pieces on the history of callsigns for a contract proposal to write the 100 year history of USMC aviation but we didn't win the contract. Too bad, because it would have been timely. Now, I'm thinking of doing it on my own dime and as my contribution to the 100th anniversary. Appreciate any help you can offer. By the way, please add the squadron callsign - Wolfpack, to HMH-466. I was the 2nd CO of that squadron (87-88).