A modified MC-130J waits for its next mission as another C-130 lifts off above it at Eglin Air Force Base, Fla. The test aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

An MC-130J test aircraft sits in King Hangar awaiting its next mission at Eglin Air Force Base, Fla. The aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

A Lockheed Martin contractor attaches the MC-130J to an aircraft tow vehicle at Eglin Air Force Base, Fla. The test aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

A modified MC-130J is pulled to its parking spot by an aircraft tow vehicle at Eglin Air Force Base, Fla. The test aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

Preflight checks are underway on a modified MC-130J at Eglin Air Force Base, Fla. The test aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

Lockheed Martin maintenance contractors pull the generator cable way from an MC-130J prior to a mission at Eglin Air Force Base, Fla. The test aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

A maintainer and loadmaster watch as the MC-130J’s engine spins up prior to a mission at Eglin Air Force Base, Fla. The test aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

Jeff Frisbe, a Lockheed Martin contractor with the 413th Flight Test Squadron, waits for word to begin marshalling out the MC-130J for a test mission at Eglin Air Force Base, Fla. The aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

A modified MC-130J lifts off from Eglin Air Force Base, Fla., for a test mission. The aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)

A modified MC-130J lifts off from Eglin Air Force Base, Fla., for a test mission. The aircraft has been fitted with vertical fins on each wing, called winglets. The 413th Flight Test Squadron aircrew and engineers tested the modified aircraft over eight flights. The goal of the tests was to collect data on possible fuel efficiency improvements and performance with the winglets and lift distribution control system installed. (U.S. Air Force photo/Samuel King Jr.)