The purpose of this quantitative study was to examine undergraduate military veteran students’ self-determination and academic effort in relation to their nonveteran college peers. A total of 734 undergraduates attending 4-year institutions in Texas completed a survey, including: 76 veterans (63% males, 37% females); and 658 non-veterans (26% males, 74% females). This research created a more holistic survey of self-determination by adding the 8-item New General Self-Efficacy Scale to the 10-item Self-determination Scale. The survey also included 13-items drawn from the National Survey of Student Engagement. A factor analysis with a varimax rotation of the items identified six factors: competence, autonomy, relatedness, reflection, learning strategies, and quantitative reasoning resulting in a significant Bartlett’s test of sphericity (2 (465) = 12324.53, p < .001). The first hierarchical ordinary least squares (HOLS) analysis results showed that undergraduate veteran students have statistically significant higher levels of self-determination than students without military experience with a small effect size (R2 = .022%, p < .001); however, a meta-analysis of self-determination revealed a large effect size of d = 1.33 between veterans (M = .81, SD = .12) and freshmen undergraduates (M = .65, SD = .12). The second HOLS analysis revealed that self-determination is a positively related, statistically significant factor in academic effort potentially adding 6.8% variance explained to the multi-factored general causal model of college impact (GCMCI).