Sept. 10, 2018 ‘Make a Difference Day’ service projects save JBSA thousands of dollars; now accepting applications In a single day, Joint Base San Antonio benefited from approximately $22,000 worth of volunteer service during the 2017 Make a Difference Day. Volunteers cleaned headstones as part of an historic preservation project at the JBSA-Fort Sam Houston National Cemetery and gardened at the JBSA-Lackland