You must place _unit in an array for countType to check it.
So change it to:
? "man" countType [_unit] >0:...
Also, I didn't check it, but I think the
:deleteVehicle
will not work. Don't you mean
:goto "deletevehicle"
But that may not work, as I would imagine "deleteVehicle" is a reserved word, as it is a function in OFP. I'd change the section name to something else.