This is the code for an amazing admin menu by Zalew (whoever he is) https://pastebin.com/TRJgBULN
Just get a empty GSC file and copy all that into the empty GSC. Then rename the GSC to "_missions".
Now you can place the _missions.gsc in the gametypes folder. That will give you an amazing admin menu that you open on "5". You can do everything with that menu. Almost, except giving yourself weapons. I think there is a good reason that none of the admin menus have a give weapon function.
BTW: You can paste that _missions into any mod to get an amazing admin menu and you don't need to do anything in the _rank.gsc