In our project MXD it's Geographic Coordinate System is "NAD1983" and Projected Coordinate system is "NAD_1983_BLM_Zone_11N", and I published Map and WMS service from this MXD, while publishing in capabilities I checked mark on both Mapping and WMS. After publishing services I opened both services in blank MXD for Map service Geographic Coordinate System and Projected Coordinate system were same as source MXD but in WMS service Geographic Coordinate System changed to WGS_1984 and for Projection it showing supported coordinate system are WGS_1984, NAD_1983_BLM_Zone_11N. I am not getting why in WMS service Geographic Coordinate System changed to WGS_1984?