Study sample statistics.

*The total number of respondents (N = 667) does not equal the sum of the military services because several respondents (N = 32; 5%) failed to indicate their respective service and 2 respondents categorized themselves as Public Health Service. **The total of those who participated in MSO-DR missions (N = 316) does not equal the sum of the military service members who participated in MSO-DR missions because several respondents (N = 18) failed to indicate their respective service.