Staff Sgt. Matthew Erfman, 802nd Security Forces Squadron military working dog handler (left) and Staff Sgt. Sean Tucker, 802nd Security Forces Squadron military working dog handler (right) conduct a demonstration with military working dog Tarzan before a group of area school superintendents and administrators at Joint Base San Antonio-Lackland Annex Jan. 23. The group of 15 school superintendents and administrators toured JBSA-Lackland at the invitation of JBSA leaders.