Marines with Headquarters Battalion conduct a rifle salute during the Memorial Day ceremony at Joshua Tree Memorial Park and Mortuary May 26, 2014. The event was dedicated to the remembrance of service members who made the ultimate sacrifice. - Marines with Headquarters Battalion conduct a rifle salute during the Memorial Day ceremony at Joshua Tree Memorial Park and Mortuary May 26, 2014. The event was dedicated to the remembrance of service members who made the ultimate sacrifice.