Jackman has commanded the 1st Battalion, 14th Infantry, 25th Infantry Division (Light); 2nd Brigade, 7th Infantry Division (Light), Fort Ord, California; and the Ranger Training Brigade, Fort Benning, Georgia. It was under then-Colonel Jackman's command at the Ranger Training Brigade that four Ranger Candidates were killed in training on February 15, 1995 in the Florida swamps of Eglin Air Force Base Killed were Captain Milton Palmer, Second Lieutenant Curt G. Sansoucie, Second Lieutenant Spencer D. Dodge, and Sergeant Norman Tillman. It was reported to be the worst incident in the Ranger School's 44-year history [http://www.arlingtoncemetery.net/mpalmer.htm. Multiple accounts held the leadership climate, both at the command level and at the trainer level, responsible for the multiple errors that led to the training accident and deaths. Among the reasons named for the deaths include the command's lack of a proper risk assessment of the weather conditions surrounding the exercise before it took place and the Ranger trainers' decision to continue with the exercise despite poor training conditions and high water dangers. As a result of the accident, the Ranger School's command changed swamp training to include more food and sleep for trainees and now require trainers to go into potentially high water before their trainees do.[http://scholar.lib.vt.edu/VA-news/VA-Pilot/issues/1995/vp950823/08230503.htm] No evidence exists to suggest that Jackman suffered any career-related consequences due to the incident.