Sukhoi Su-25 Frogfoot (Part 4). I present a comprehensive AI traffic model package for this close air support aircraft. The Su-25, known as the Grach (Rook), was put into service in 1981, was designed as a comparable aircraft to the USAF A-10 Warthog, focused on battlefield close air support. Starting with Afghanistan, the Su-25 proved itself to be an extremely versatile and survivable aircraft, and has been in service ever since. Just over 1,000 were built in various models, and have been or are operated by thirty countries. An original 8-LOD model brings this historic aircraft to the flightsim world. This is part 4, combined with Parts 5 and 6, representing the Su-25 in all operational models (Su-25, Su-25M1, Su-25T, Su-25UB, Su-25UTG), in the past and current service of all export or Soviet successor states excluding the export users in part 1; with 34 models and 247 repaints. For those who only want one era or the other in their flightsim world, a detailed explanation of current or past users is in the documentation. Aircraft, textures, and flight dynamics by Michael Pearson.