The term "GR4" typically refers to a category of military aircraft, specifically the Tornado GR4, which is a variant of the Panavia Tornado. This aircraft is designed for ground attack missions and is equipped with advanced avionics and weaponry. It can operate in various weather conditions and is known for its variable-sweep wing design, allowing it to adapt to different flight profiles. The Tornado GR4 has been used by the Royal Air Force and other air forces since the 1990s. It is capable of carrying a wide range of munitions, including precision-guided bombs and missiles, making it a versatile asset in modern warfare. The aircraft has played a significant role in various military operations around the world.