The 15 months according to ARMY TIMES only starts after basic training and some AIT.
But the big killer of 15 months, 24 months, etc is that 8 year obligation. Yes, it is law and everyone puts there initials on it, but all most to a man everyone thought it applied to officers or during a declared state of war. Not a contiuious war that might last for decades as now.
Many I think would enlist for two years (ie like they volunteered for the draft in the Vietnam War) if they knew that after that two years they were free of any chance of a recall to service unless Congress passed by a 3/4 vote allowing it.
But that 8 year obligation is the killer. And those anti-war groups that are today dodging the recruiters go out of their way to point this out.
Jack E. Hammond