It appears to be a mount for a CIWS system (General Dynamics model). I could be wrong but it has almost the identical mount for the 1980's version for ship mounting (Twin hand/footholds on the side and the Ammunition drum appear identical as well as compass pad disk encircling the bottom of the mount itself).
If it is as Glyn mentions a glide slope indicator (GSI) it has certainly changed since the last version I have seen. Odd that it resembles a CIWS so much.
I still side with an anti aircraft/missle weapons system. They appear way to much alike including the cabinet mount and the Ratheon decal along side.
