Military Stalkers can be either expert Stalkers that have been contracted by the Ukrainian Military and have received military training and equipment - or Ukrainian Special Forces who have specialized experience operating inside the Zone. In the games they are typically ranked as experts, and may or may not sport Military Ranks attached to their names. They appear in S.T.A.L.K.E.R.: Shadow of Chernobyl, S.T.A.L.K.E.R.: Clear Sky and S.T.A.L.K.E.R.: Call of Pripyat.