U.S. Army and Navy polo teams compete against one another during the annual Military Appreciation Weekend May 6, 2017 at Joint Base San Antonio-Fort Sam Houston, Texas. U.S. Army North and JBSA hosted the two-day event, which featured music, family activities, and various military demonstrations. This year, the appreciation weekend also commemorated the 300th anniversary for the city of San Antonio. (U.S. Air Force photo by Ismael Ortega / Released)