Im CONUS to CONUS, out & back to PIT in the spring. From talking to my functional he suggested OCONUS would equal tdy enroute, otherwise expect O&B. Having been a MDS FTU instructor and program manager my guess is it’s not as much to do about the ability to flex RNLT dates (paperwork drill) but rather if someone doesn’t complete training for any reason - medical, performance, etc. O&B they can easily return you to your previous base, enroute is a much more complicated problem