and had twin lens pods on both sides of the intake to enlarge the relatively small radar cross section of the F-16. Any equipment not necessary for visual-range aerial combat was removed, enhancing their agility and dog-fighting abilities. These F-16s were designated F-16N, and twenty-two single seat aircraft and four twin seat, designated the TF-16N, were built for the US Navy and flown at its famous "TOPGUN" Navy Fighter Weapons School starting in 1987. They were also flown by VF-43, VF-45 and VF-126, which were still active duty Adversary squadrons at the time. Despite the airframe being strengthened to cope with the continuous high-G loads associated with air combat maneuvering, cracks were detected on the wings after only a few years of operation, leading to grounding of the Navy F-16 fleet by 1992 and complete retirement of the F-16N by 1994. In 2002, the Navy began to receive fourteen F-16A and F-16B models from AMARC at Davis-Monthan AFB that were brand new aircraft originally intended for Pakistan, but had been embargoed. All 14 are operated by NSAWC for use by TOPGUN in addition to the F/A-18A aircraft already in operation at NAS Fallon. Aggressor aircraft in the United States are typically painted in colorful camouflage schemes, matching the colors of many Soviet aircraft and contrasting with the gray colors used in most operational US combat aircraft. Camouflage schemes that consist of many shades of blue (similar to those used in Sukhoi fighters) or of green and mostly-light brown (similar to the colors used in many Middle Eastern countries' combat aircraft) are most common. US Squadrons Aggressor squadrons in the US armed forces include the USAF 18th Aggressor Squadron at Eielson AFB, the 64th, the 65th Aggressor Squadrons at Nellis AFB, the US Marine Corps' VMFT-401 at MCAS Yuma and the US Navy's VFC-12 at NAS Oceana, VFC-13 at NAS Fallon, VFC-111 at NAS Key West and VFC-204 at Naval Air Station Joint Reserve Base New Orleans, as well as the famous "TOPGUN" Naval Fighter Weapons School (US Navy) which is not a squadron per se, but operates F-16A and F/A-18A/B/E/F aircraft as part of the Naval Strike and Air Warfare Center (NSAWC) at NAS Fallon. With the exception of the NSAWC aircraft, all the US Navy and US Marine Corps adversary squadrons are Reserve Component units and aircraft belonging to the Navy Reserve and the Marine Corps Reserve. The USAF