the ability to accurately indicate a craft's mission without losing commonality with the basic design MDS. If utilized, the modified mission symbol is placed as a prefix directly in front of the basic mission symbol (but after any applicable status prefix, see above). Modified mission symbols are not used for rockets and missiles. Currently authorized modified mission symbols are: A Attack. Similar to the basic mission symbol, A applies to aircraft modified to attack land or sea targets. Example is the AC-130U Spectre, a transport modified for ground attack missions. C Cargo. Similar to the basic mission symbol, C applies to aircraft modified to carry cargo and passengers. An example is the CT-39A, a T-39A modified for carrying cargo. D Director. Applies to aircraft modified to control unmanned aerial vehicles such as drones. An example is the DT-2B a T-2B modified to control drones. E Electronics. Applies to aircraft modified with addition of extensive electronic equipment, either for enhancement of their basic mission, or as a platform for specifically electronic missions such as providing electronic countermeasures (ECM), airborne early warning (AEW), airborne command and control (ACC), or communications relay. Example is the EP-3A Orion, a patrol aircraft outfitted with special electronics to collect electronic data. F Fighter. Similar to the basic mission symbol, F applies to aircraft modified to engage in air combat. The FA-18 and FA-22 are special examples of this H Search and Rescue. Similar to the basic mission symbol, H applies to aircraft modified to assist search and rescue (SAR) operations. Example is the HU-25 Guardian, a utility transport modified for Coast Guard search and rescue coordination. K Tanker. Applies to aircraft modified to carry and transfer aviation fuel in flight to other aircraft. Example is the KA-6D Intruder, an attack aircraft modified with tanks and hoses to provide aerial refueling. L Cold Weather. Applies to aircraft modified to operate in Arctic or Antarctic environments. Example is the LC-130, a transport modified to deliver logistics support to Antarctic stations. M Multi-Mission. Applies to aircraft modified to perform various missions, in particular special operations modifications. Also used as a catch all for missions that neither fit in any category, nor warrant their own. An example would be the MC-130H, a cargo aircraft modified to support special operations needs. O Observation. Applies to aircraft modified to perform observation of enemy or potential enemy positions, and patrol borders or areas