The purpose of this study is to test the effectiveness of a treatment called Transdiagnostic Behavior Therapy (TBT) for reducing symptoms of adjustment disorder compared to the standard treatment, or treatment as usual (TAU) for adjustment disorder called Moving Forward Problem-Solving Therapy (TAU-PST).

Participants will be randomly selected to receive 10-14 weekly sessions of TBT or TAU-PST with a licensed therapist.

This study is open to Veterans and Active-Duty service personnel in the Ralph H. Johnson VA Health Care System catchment area (including Savannah, Myrtle Beach, Hinesville and Beaufort community-based outpatient clinics).