OVERVIEW: The RC‑135S Cobra Ball is a strategic ELINT/MASINT reconnaissance aircraft operated by the U.S. Air Force. As of 2020 and beyond, it is undergoing Baseline 7 upgrades to enhance ballistic missile signature tracking, emitter detection, and communications integration.

DETAILS: Cobra Ball, derived from modified C‑135B airframes under Project Big Safari, entered service in March 1972 for mission-directed monitoring of missile launches. It is powered by four CFM F108‑CF‑201 turbofans, cruises at ~850 km/h (Mach 0.66), operates up to 45,000 ft, and has a 6,500 km unrefueled range . The aircraft is fitted with optical windows, infrared MIRA sensors, all-weather tracking radar, large-aperture cameras, and passive ELINT/MASINT equipment in specialized nose and fuselage fairings. Its crew complement includes two pilots, one navigator, three electronic warfare officers, two systems engineers, and mission specialists.

Baseline 7 upgrades, initiated in Fiscal Year 2020, introduce advanced capabilities: Rivet Joint system integration, digital electromagnetic signature direction finding, enhanced digital search, and SATCOM-assisted target discrimination, expanding Cobra Ball’s tracking fidelity and data sharing .

TYPE: Strategic ELINT and MASINT Reconnaissance Aircraft

FUNCTION: Cobra Ball tracks optical, infrared, and electromagnetic signatures of ballistic missiles during boost and reentry. With Baseline 7 improvements, it also integrates enhanced geolocation for broader mission relevance in treaty verification and missile defense contexts.

NOTE:
IOC: March 1972
Manufacturer: Boeing (airframe), L‑3/Textron/L3Harris (mission systems)
Operators: U.S. Air Force (55th Wing, 45th Reconnaissance Squadron)
Baseline 7 Development: FY 2020–present
Conflict used in: Cold War (Kamchatka monitoring), Operations Desert Storm, Enduring Freedom, Iraqi Freedom, ongoing strategic missions

SOURCE:
U.S. Air Force Fact Sheet – RC‑135S Cobra Ball: https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104498/rc-135s‑cobra‑ball/ ; Air & Space Forces Magazine – RC‑135S Baseline 7: https://www.airandspaceforces.com/weapons-platforms/rc-135s/ ; C‑MANO DB – RC‑135S: https://cmano-db.com/aircraft/556/ ; Wikipedia – RC‑135S Cobra Ball: https://en.wikipedia.org/wiki/Boeing_RC-135 ; GlobalSecurity.org – RC‑135 overview: https://www.globalsecurity.org/military/systems/aircraft/rc-135.htm