[YaYa123]

While I hope you know what you're talking about, why don't you know that Lt. Col is always written " LTC "?

[Hank All-American]

I don't specifically recall that being the case (that LTC was the only abbreviation for Lt. Colonel) in the Air Force. I'm not saying it wasn't. I just don't recall. The use of "1st Lt." as an abbreviation likewise did not jump out at me as being a strong indicator, even though 1Lt does seem more appropriate. I tried to limit my points to just a few that I thought were enough to conclude the document I specifically reviewed--the "01 August 1972" memorandum--was fake. I think it is.

[RVN Airplane Driver]

Because in the Air Force it is written as Lt. Col....the Army has used the 3 letter rank...LTC since the late 60's..that is the reason. The Marines also use the Lt. Col designation if memory serves me correctly.