What type of aircraft is designated for in-flight refueling and tactical transport?

The KC-130 Hercules is specifically designed for in-flight refueling operations as well as tactical transport. Its primary mission is to serve as a refueling platform for various aircraft, which allows military operations to extend their reach and stay airborne longer without needing to land for fuel. In addition to its refueling capabilities, the KC-130 can also transport personnel, cargo, and perform other tactical airlift missions, making it a versatile asset in military operations.

Other aircraft listed, such as the F-15 Eagle, are primarily designed for air superiority and combat roles rather than refueling. The Boeing 737 is a commercial aircraft not used for military tactical operations in this context, while the C-130 Hercules, although it has transport capabilities, does not have the specific role of in-flight refueling that the KC-130 variant has. Thus, the KC-130 Hercules stands out as the aircraft designated for both in-flight refueling and tactical transport missions.