A crewman poses beside an A-1 Skyraider designated for Search and Rescue (SAR) alert duty, marked by the sign reading 'SAR ALERT A/C — Controlled Area.' A-1s flying in this role, callsign 'Sandy,' escorted rescue helicopters into hostile territory to recover downed aircrew, braving heavy ground fire to protect the rescue force — one of the most demanding and celebrated missions flown during the Vietnam War. Project: 218824