The F-117 Nighthawk and the B-2 Spirit are 21 years old and 15 years old respectively. If we already know about the F-22 Raptor, F-35 Lightning, HTV-3X Blackswift, imagine what we don't know about: TR-3B etc. The fleet of aircraft we saw in Iraq is obsolete: Russian Engineers Admit Using F-117 Wreckage for Tests.
Russian engineers have been testing the remains of a downed U.S. Air Force F-117 stealth fighter. Serb forces shot down the F-117 in 1999 during the Kosovo air campaign.
Russia Using F-117 Wreckage for Anti-Stealth
Senior Russian aerospace officials admitted that the F-117 was being used to test new anti-stealth technology and advanced missiles designed to shoot down U.S. aircraft. Russian researchers are testing components of a new air defense system against the F-117 remains.
The Russian anti-stealth tests include radio frequency seekers from surface-to-air missiles and proximity fuses for missile warheads.
In addition, a small number of Russian tactical aircraft have been modified with low-observable stealth technology in order to conduct airborne tests against the new air defense systems.
Russian missile makers Antey Industrial Corp. and the Almaz Central Design Bureau are using the F-117 and modified Russian-made stealth aircraft to test components for the next generation of Russian Surface to Air Missiles (SAMs).