The Soviets copied the British Rolls-Royce Nena jet engine and used it to power the advanced MiG-15 in one of the greatest modern British technological military blunders. Militaries have always copied each other, and while the Soviets came up with a number of interesting designs of their own, they were famous for copying the West. The Tupolev Tu-4 was famously a reverse-engineered copy of the Boeing B-29 Superfortress, while the Sukhoi Su-24 was something of a copy of both the F-111 Aardvark and the French Mirage G8.