How many crew members are there for tactical operations in the CH-47D?

The CH-47D Chinook, a multi-mission, heavy-lift helicopter used by military forces, is typically operated by a crew of four members. This crew includes the pilot, co-pilot, flight engineer, and a crew chief. Each member has specific roles that are crucial for the safe and efficient operation of the aircraft during tactical operations.

The pilot and co-pilot manage the flight controls and navigation, while the flight engineer oversees the helicopter's systems and assists with flight operations. The crew chief is responsible for the safety of personnel and equipment on board during the flight and assists with load operations. The coordination of these crew members is essential, especially in combat or tactical scenarios where situational awareness and teamwork are critical for mission success.

The other choices suggest a different number of crew members, which does not align with the standard operational procedure for the CH-47D in tactical missions. Therefore, the correct answer highlights the typical crew configuration necessary for effective operations in various environments.