The present study examined latent class trajectories of posttraumatic stress disorder (PTSD) and associations between demographics, prior trauma, and reason for referral on class membership. Children ages 7–18 (n=201) were recruited for participation in the Navy Family Study following reports to the U.S. Navy's Family Advocacy Program (FAP). Initial interviews were conducted 2–6 weeks following FAP referral, with follow-ups conducted at 9–12, 18–24, and 36–40 months. Growth mixture modeling revealed two latent class trajectories: a resilient class and a persistent symptom class. Relative to youth in the resilient class, participants in the persistent symptom class were more likely to be older and to report exposure to a greater number of trauma experiences at Time 1.