Start out by searching the military websites. You can do this by searching in Google for "anything in site:.mil" and you can search "site:.gov" for other general government material.
Military Statistics: https://www.dmdc.osd.mil/appj/dwp/dwp_reports.jsp
Training and other statistics from the DoD: https://www.dmdc.osd.mil/appj/dwp/stats_reports.jsp
Sexual Harassment: https://www.sexualassault.army.mil/
Families Coping with Deployed Active Members: https://www.militaryonesource.mil/family-relationships/parenting-and-children/parenting-through-deployment/deployment-resources-for-families