12 operators harvested private voices from 2-MHz to 18 GHz
By Miriam Adler ·
Private communications were vacuumed from the airwaves by Pennsylvania Air National Guard crews using sensor packages that turned cargo planes into listening posts.
The aircraft is a C-130 Hercules, a workhorse of the military transport world, but the EC-130E variant known as Comfy Levi carries a different kind of cargo. It does not carry paratroopers or pallets of rations. Instead, it carries a pallet-mounted signals intelligence (SIGINT) suite. When this equipment is installed, the plane sports what a program page mirrored by the Federation of American Scientists describes as large "'farms' of antennas" on the rear cabin doors and undercarriage fairings.
These antenna arrays are not permanent. The record notes that installation of the entire suite takes about 12 hours, with the arrays fitted to the tail, parachute doors, main gear deflector panels, and main gear doors. For those 12 hours, a transport plane is converted into a vacuum for the airwaves.
"Farms" of Antennas
The terminology used in these records is often designed to sanitize the act of listening. The name "SENIOR SCOUT" suggests a youthfulness, a helpfulness, perhaps even the civic-mindedness of the Scouts Association of Malaysia, where the King's Scout award is a pinnacle of leadership and community service. But in the lexicon of the Air Intelligence Agency, a "scout" is a radio signal monitoring sensor package.
This is not passive listening. The record describes a "hostile" electronic environment where the enemy has the ability to jam communications, intercept nonsecure transmissions, and pinpoint the position of any aircraft emitting a signal. In response, the Comfy Levi operates as part of the SENIOR HUNTER mission, providing airlift and support for Commando Solo aircraft. These missions may involve "extended orbit delays" at the aircraft's operating ceiling or a "combat profile" involving low-altitude flight to avoid detection while moving toward the mission orbit area.
Document imagery from irp.fas.org From the files: irp.fas.org
2-MHz to 18 GHz
At the heart of the SENIOR SCOUT system is the Airborne Collection Electronic Signals II (ACES II) capsule. This capsule accommodates between 4 and 12 operators. Their job is to monitor two distinct realms of the electromagnetic spectrum: 2-MHz to VHF for communications intelligence (COMINT) and 2-18 GHz for electronic intelligence (ELINT).
To the operators inside the capsule, the world is reduced to frequencies. COMINT is the interception of people talking—the raw, human element of intelligence. ELINT is the interception of non-communication signals, such as the pulses of a radar installation. Together, they provide a comprehensive map of an adversary's electronic presence. The record is silent on whose voices were being harvested in these capsules, but the capability is absolute. By spanning the gap from 2-MHz to 18 GHz, the ACES II capsule ensures that almost nothing transmitted through the air remains private.
Howard AFB Panama
Surveillance is rarely confined to a single theater of war. The record identifies a specific mission called FLOWING PEN, which serves as a "tool used in counter drug mission." The logistics of this operation highlight a curious division of labor within the reserve components: the mission is operated by the Utah Air National Guard but flown by the Pennsylvania Air National Guard.
Six times a year, for two-week periods, these FLOWING PEN operations deploy to Howard AFB in Panama. The phrasing "counter drug mission" is the standard euphemism of the era, a broad umbrella that often covered a wide array of regional monitoring and intervention. The record does not specify what the aircraft were listening for in the skies over Panama, only that the C-130s were there, orbit-bound and collecting.
This capability extended beyond the National Guard. The record describes SENIOR WARRIOR, a US Marine Corps system that utilized the same SENIOR SCOUT technology fitted on Marine Corps C-130s. These aircraft were deployed during Operations Desert Shield and Desert Storm, bringing the same frequency-harvesting capabilities of the Comfy Levi to the sands of Iraq and Kuwait.
The files list the units involved: the 169th Intelligence Squadron of the Utah Air National Guard, the 193rd Special Operations Wing of the Pennsylvania Air National Guard, and the 24th Wing's CORONET OAK. They describe a system that can be bolted onto a standard C-130E or C-130H, turning a cargo plane into a listening post in half a day. The record leaves the specific targets of these missions unnamed, noting only the technical specifications of the capsules and the frequency of the flights to Panama.