A combined post with additions, just by way of wrapping this up (citations still a bit inconsistent, sorry!). Thanks to all who sent in suggestions:
Incomplete Bibliography on Suicide in Historical Militaries
Armed Forces Health Surveillance Center (AFHSC). Deaths by suicide while on active duty, active and reserve components, U.S. Armed Forces, 1998-2011. MSMR. 2012 Jun;19(6):7-10. PubMed PMID: 22779434.