// See if the ship is currently in the mission. If not, check if it is on the arrival list.
            // Otherwise, we can assume it was destroyed or departed.
            shipnum = ship_name_lookup( name );
            if ( shipnum == -1 ) {
                // see if ship is yet to arrive.  If so, then return 0 so we can evaluate again later.
                if ( mission_parse_get_arrival_ship( name ) )
                    return 0;