 Other specialized payloads, such as SIGINT packages, or new lightweight synthetic aperture radar (SAR)sensors with all-weather imaging capability, are now being fielded as well.The larger combat surveillance UAVs have landing gear, usually fixed, and can take off and land on an unimproved airstrip, with an arresting hook to snag a cable for short landings.Such UAVs may also be launched by a RATO booster, and recovered by parachute, parasail, or by flying into a net.