It was another routine daytime mission in Afghanistan: two CH-47 Chinook aircraft loaded with key personnel would conduct an air movement to a landing zone (LZ) that the crew had landed at dozens of times. The crew consisted of a seasoned pilot in command (PC) with about 3,500 hours, an experienced pilot (PI) with 500 hours and two nonrated crewmembers — a crew chief (CE) and a flight engineer (FE) — with unknown flight hours. The crew had recency of flight together, as well as recency in landing at this specific LZ.