You may have noticed that some monuments are missing, that's because they make use of a variable ID. What does it mean? Basically, they will be different for each server you play. This only happens on the Abandoned Military Base and the Underwater Labs. If you want to obtain them, you can go to these monuments and in the case of the Underwater Labs, you have a Computer Station in a room which contains all the variable ID's for that monument in that server or wipe.