What j-man means is: "COLUMN" i think.
btw - for your original question:
If you ever wanted to make a condition waiting for a bunch of
guys being mounted onto one or more vehicles:
"vehicle _x == _x" count any_array == 0
:note - any_array can be:
units groupnamename_of_array[unit1,unit2,unit3,unit4]list triggername~S~ CD