Largely completed by 1973, USS Nimitz was not commissioned until 1975 due to the late delivery of essential components for her nuclear power plant. In 1975 Nimitz joined the Atlantic fleet, ending Enterprise's reign as the largest warship in the world. The carrier's flight deck is generally the same as that of the Kitty Hawk but with the cut-off forward flight deck first seen on the John F. Kennedy. Between 1975 and 1985 Nimitz made numerous cruises in the Atlantic and the Mediterranean. In 1980 the carrier made a round-the-world deployment. While in the Indian Ocean, she served as the seaborne base for the abortive Teheran hostage rescue mission, Operation Eagle Claw. At the start of the 1981 Mediterranean cruise, the F-14 made its air-to-air combat debut when two VF-41 Tomcats from Nimitz shot down two attacking Libyan Sukhoi Su-22 fighters. In 1987 Nimitz transferred from the Atlantic Fleet to the Pacific Fleet, embarking Air Wing Nine which had previously been attached to the USS Kitty Hawk. Due to a shortage of F-14Bs, Nimitz's two Tomcat units transitioned back to the F-14A in early 1992.