The 2K6 Luna is a Soviet short-range artillery rocket complex. Luna rockets are solid-fuel, unguided and spin-stabilized. "2K6" is its GRAU designation. Its NATO reporting names are FROG-3 and FROG-5. From 1965, the 2K6 Luna was replaced by the far more successful 9K52 Luna-M, which was known in the West as the FROG-7.