190824-N-FO574-1060 SANTA MARTA, Colombia (Aug. 24, 2019) Lt. Cmdr. Martin Casarez, a physical therapist assigned to the hospital ship USNS Comfort (T-AH 20), demonstrates how to use a walker to a patient experiencing lower back pain when using a cane at a temporary medical treatment site in Santa Marta, Colombia, Aug. 24, 2019. Comfort is working with health and government partners in Central America, South America and the Caribbean to provide care on the ship and at land-based medical sites, helping to relieve pressure on national medical systems strained by an increase in Venezuelan migrants. (U.S. Navy photo by Mass Communication Specialist Seaman Jordan R. Bair/Released)