To know if your line is a ZAIN army line, dial *113#
If it is, you should see "You are on Zain Army Line. Zain-Zain=1p, Army-Army=2files, Zain to other operators=4p, Monthly subscription 1.5JD."
NOTE, in the above there is a spelling mistake, this is what is written in the SMS and fils did indeed appear as files in the command response, this was dated 2011-09-24.
Army lines are not available for sale, Buying an army line registered to someone else (Buying it from someone in the army) will allow that person to get his/her line back at the time of his/her choice, this offer is available to retired and in service army personnel only.
Mokalafeen do not seem to be included