An unidentified visitor takes a snapshot of the Philippine flag flying at half-staff In Lipa City’s Fernando Air Base as the Philippine Air Force mourns the death of Captain Christian Paul Litan and Staff Sergeant Byron Tolosa who died after their UH-10 helicopter crashed at Brgy. Sampaloc in Tanay, Rizal on May 4, 2017. President Rodrigo Duterte visited the wake of the two deceased PAF personnel on May 7, 2017.