Context_1 : The 97th Airlift Squadron is a United States Air Force Reserve squadron, assigned to the 446th Operations Group, stationed at Joint Base Lewis-McChord, Washington. It is a USAF Associate Unit of the active duty 4th Airlift Squadron, 62d Airlift Wing. Context_2 : The 249th Airlift Squadron (249 AS) is a unit of the 176th Wing of the Alaska Air National Guard located at Joint Base Elmendorf-Richardson, Anchorage, Alaska. The 249th is an associate unit of the 517th Airlift Squadron, which is equipped with the Boeing C-17 Globemaster III. Context_3 : The 728th Airlift Squadron is a United States Air Force Reserve squadron, assigned to the 446th Operations Group, stationed at McChord Field, Joint Base Lewis-McChord, Washington. It is an associate unit of the active duty 8th Airlift Squadron, 62d Airlift Wing. Context_4 : The 30th Airlift Squadron an inactive United States Air Force unit. Its last assignment was to the 19th Operations Group. It was the first active-duty associate unit of an Air National Guard wing, working with the 187th Airlift Squadron at Cheyenne Air National Guard Base, Wyoming. It operated the Lockheed C-130 Hercules aircraft of its colocated Guard unit, conducting airlift missions. Context_5 : The 36th Airlift Squadron (36 AS) is the only forward-based tactical airlift squadron in the Pacific Area of Responsibility. Formerly an Air Mobility Command (AMC) unit, and a Military Airlift Command (MAC) and a Tactical Air Command (TAC) unit before that, the squadron is now part of Pacific Air Forces (PACAF). It maintains a forward presence and supports combat operations by providing responsive movement of personnel and equipment through aerial delivery and assault airland operations. It maintains C-130H Hercules mission-ready aircrews to conduct theater airlift, special operations, aeromedical evacuation, search and rescue, repatriation and humanitarian relief missions. Context_6 : The 313th Airlift Squadron is a United States Air Force Reserve squadron, assigned to the 446th Operations Group, stationed at McChord Field, Joint Base Lewis-McChord, Washington. It is a associate unit of the active duty 7th Airlift Squadron, 62d Airlift Wing. Context_7 : The Lockheed C-130 Hercules is a four-engine turboprop military transport aircraft designed and built originally by Lockheed (now Lockheed Martin). Capable of using unprepared runways for takeoffs and landings, the C-130 was originally designed as a troop, medevac, and cargo transport aircraft. The versatile airframe has found uses in a variety of other roles, including as a gunship (AC-130), for airborne assault, search and rescue, scientific research support, weather reconnaissance, aerial refueling, maritime patrol, and aerial firefighting. It is now the main tactical airlifter for many military forces worldwide. Over forty variants and versions of the Hercules, including a civilian one marketed as the Lockheed L-100, operate in more than 60 nations. Context_8 : The 757th Airlift Squadron was a regular U.S. Air Force squadron from the 1940s to 1973. The unit was reassigned to the USAF Reserve in 1973. The unit relocated in 1992 from 907 AW Rickenbacker ANGB, Ohio to 910 AW at Youngstown Air Reserve Station, Ohio. The mission of the 757th Airlift Squadron is to maintain a large-area fixed-wing aerial application capability to control disease vectors in combat areas and on Department of Defense installations; to maintain a large-area application capability to control vegetation and pests of vegetation on DoD installations; and to provide aerial spray training. Context_9 : The 54th Airlift Squadron is a United States Air Force squadron stationed at Scott Air Force Base, Illinois. The squadron is an active duty associate unit aiding the 932d Airlift Wing in performance of its airlift mission. The first predecessor of the squadron was formed in August 1917 as the 54th Aero Squadron and served in France during World War II. In 1936, this unit was consolidated with the 54th School Squadron, a pilot training unit that became the 54th Bombardment Squadron, which became a demonstration unit for the Air Corps Tactical School, and later a test and evaluation unit for medium bomber aircraft and tactics. Context_10 : The 345th Airlift Squadron is an inactive United States Air Force squadron most recently assigned to the 19th Operations Group at Keesler Air Force Base, Mississippi, where it was inactivated in June 2014. The squadron was activated in the summer of 2010 as an "active duty associate" squadron, jointly operating the Lockheed C-130J Hercules aircraft of the 815th Airlift Squadron. fact_1 :  It operated the Lockheed C-130 Hercules aircraft of its colocated Guard unit, conducting airlift missions. fact_2 : The Lockheed C-130 Hercules is a four-engine turboprop military transport aircraft designed and built originally by Lockheed (now Lockheed Martin). Answer: four-engine
Output: How many engines does the aircraft operated by the 30th Airlift Squadron have?