The impact of moral injury on trajectories of depression: a five-year longitudinal study among recently discharged Israeli veterans.

Background: Perpetrating or witnessing acts that violate one's moral code are frequent among military personnel and active combatants. These events, termed potentially morally injurious events (PMIEs), were found to be associated with an increased risk of depression, in cross-sectional studies. However, the longitudinal contribution of PMIEs to depression among combatants remains unclear.

Method: Participants were 374 active-duty combatants who participated in a longitudinal study with four measurement points: T1-one year before enlistment, T2-at discharge from army service, and then again 6- and 12-months following discharge (T3 and T4, respectively). At T1, personal characteristics assessed through semi-structured interviews. At T2-T4, PMIEs and depressive symptoms were assessed.

Results: At discharge (T2), a total of 48.7% of combatants reported experiencing PMIEs incident, compared with 42.4% at T3 and 30.7% at T4. We found a significant interaction effect in which combatants endorsing PMIEs at discharge reported higher severity of depression symptoms at discharge (T2) than combatants who reported no PMIEs. This effect decreased over time as depression levels were lower at T3 and T4.

Conclusions: PMIE experiences, and especially PMIE-Betrayal experiences, were found to be valid predictors of higher severity of depression symptoms after the first year following discharge.