My recollection is that the 18 series was introduced to the enlisted side first, although it must have been in '84, as it didn't happen when I was a detachment commander in '83. September is when I got designated as an 18A...officers didn't have an S suffix, but rather 5G, so as an infantry officer I was an 11B005G. Actually, my duty MOS as a lieutenant was 48E005G, Unconventional Warfare Officer. As they were developing the 18 Specialty Code, that changed. The Foreign Area Officer types didn't like being saddled with SF types.All of my reading, nerding out, and talking to guys from the 80's, and I can't recall a year earlier than '84.