The character Major Alexander Degtyarev from the video game S.T.A.L.K.E.R . was an experienced stalker and a USS agent .
The player , Major Alexander Degtyarev , an experienced stalker and SBU agent , is sent into the Zone to investigate the crash sites on behalf of the army .
S.T.A.L.K.E.R.-COLON- Call of Pripyat