Parenting programs aim to improve parenting quality, which may, in turn, support various aspects of child development, including behavior and mental health. However, parenting interventions show considerable heterogeneity in response patterns across different families, demonstrating that they are not one-size-fits-all programs. This variability points to a need for greater understanding of which families benefit most from these interventions and how to improve response among those who do not. Following this literature gap, this study employed a person-centered approach to identify different parenting profiles associated with heterogeneity in treatment responses to a family-based prevention interventions adapted for military families. This study used data from a randomized controlled trial of the ADAPT intervention for 336 US military families in which at least one parent had deployed to war. Latent profile analyses revealed three unobserved parenting profiles among mothers and fathers, reflecting "High positive," "Moderate positive," and "Coercive" parenting styles. Latent transition analysis (LTA) suggested that the ADAPT program led to improvements in parenting, particularly among mothers who began the program with moderate or typical levels of parenting skills, and that these positive changes in parenting may help to decrease child externalizing problems. For fathers, the ADAPT program was most effective in preventing declines in positive parenting among those with initially typical levels of positive parenting. Overall, study findings demonstrate considerable heterogeneity in parenting behavior among a sample of military families that is associated with variability in parent responses to the evidence-based parenting program.