TPS has a nominal commitment of 4 years.
Direct from the NAVADMIN:
"The preferred Unrestricted Line (URL, 13X0) aviators are junior
officers (O-2 or O-3) with detailer-forecasted career timing to complete the
selected TPS program and a 36-month follow-on test tour prior to their
expected Department Head tour..."
Is this what you mean by the 4 year nominal obligation? (1 year at TPS followed by a 36 month test tour) Or is there an actual obligation in addition to or concurrent with your MSR? I know that the 36 month test tour can be shortened to as little as 24 months, but I'm not able to find anything about an additional service obligation beyond MSR.