re: #163 Belafon

I think that’s 1.5 years.

Looks like the army has a program that matches that time frame:

The Short Answer: Two Years With a Catch
Two years is the shortest amount of time a new enlistee can sign up for active duty, however, there is a catch. You actually have an eight-year commitment but you can perform this commitment as an active duty member, a Reservist, or Individual Ready Reservist (IRR).

This is a program but limited in scope compared to the majority of enlistments into the military:
The National Call to Service - All of the services also participate in the Congressional - mandated National Call to Service Program. Under this program, following basic training and an advanced training school, a member spends 15 months on active duty (full time), followed by a minimum of 2 years in the active (drilling) Guard or Reserves, with the remainder of the total eight-year commitment in the IRR.

However, all the services (except the Army) strictly limit the number of folks who can enlist under this program each year.