"Peters enlisted in the Army as a private, and spent ten years in Germany working in military intelligence. Years later, during the 2004 Killian documents controversy, Peters pointed out that in his front-line division in 1977, five years after the memos in question were allegedly written, only the general's secretary had an electric typewriter. It was, he says, too primitive to produce the documents in question, and moreover, National Guard units "…got the junk we didn't want."
After returning from Germany, Peters attended Officer Candidate School and received his commission, eventually attending the Command and General Staff College and U.S. Army War College. His last assignment was to the Office of the Deputy Chief of Staff for Intelligence. He retired in 1998 with the rank of Lieutenant Colonel."
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Mustangers generally are topped out at O-4. It doesn't matter how good you are, if you came in as an EM, you're considered used goods til the day you leave. My CO in VN was, by far, the best officer I've ever encountered; he was a Navy LCdr -should have made it to Admiral. His name was LCdr Karl Burnet - made it to E-8 before junping then rapidly made rank but topped out as an MI officer at LCdr.
Green Lantern
Yes,but; there are always exceptions. One made MG.