AN/DRC-8 Emergency Rocket Communications System explained

Is Missile:	yes
Emergency Rocket Communications System
Origin:	United States
Type:	Intercontinental ballistic missile/Communications System
Used By:	United States 510th Missile Squadron
Manufacturer:	Boeing
Length:	59feet
Diameter:	5feet (1st stage)
Speed:	Approximately 15000mph (terminal phase)
Filling:	UHF Transmitter
Guidance:	Inertial
Launch Platform:	Silo

The Emergency Rocket Communications System (ERCS) was designed to provide a reliable and survivable emergency communications method for the United States National Command Authority, using a UHF repeater placed atop a Blue Scout rocket or Minuteman II intercontinental ballistic missile.^[1] ERCS was deactivated as a communication means when President George H.W. Bush issued a message to stand down SIOP-committed bombers and Minuteman IIs on 27 September 1991. Headquarters SAC was given approval by the Joint Chiefs of Staff to deactivate the 494L payloads beginning 1 October 1992.^[2] However, Headquarters SAC believed it was inefficient and unnecessary to support ERCS past fiscal year 1991, and kept the accelerated deactivation schedule.

Mission

The mission of the Emergency Rocket Communications System was to provide assured communication to United States strategic forces in the event of a nuclear attack. ERCS was a rocket or missile that carried a UHF transmitter as a payload instead of a nuclear warhead. In the event of a nuclear attack, ERCS would launch the UHF transmitter into low space to transmit an Emergency Action Message (EAM) to Strategic Air Command units.^{[3] [4] [5] [6]}

The ERCS sorties had two possible trajectories, East and West, to inform SAC alert forces in the northern tier bases (i.e. Minot AFB, Fairchild AFB, Grand Forks AFB).^[7]

ERCS was deactivated and taken out of the inventory as other means of emergency communication (i.e. ISST and Milstar) came online.^[8]

Nomenclature

ERCS was also known as Project 279 (Blue Scout version) and Project 494L (Minuteman version). Sources report that the Project 279 was also known as Project Beanstalk;^{[9] [10]} while the Minuteman system may have been designated LEM-70A.^[11]

Operations

The Blue Scout version of ERCS (Program 279) was deployed to three sites near Wisner, West Point, and Tekamah, Nebraska. The Program 494L Minuteman version of ERCS was only deployed to Whiteman AFB, Missouri's 351st Strategic Missile Wing, under the direct control of the 510th Strategic Missile Squadron (later the 510th Missile Squadron).

ERCS was a three part communications system composed of the following elements:

1. The five 510th Strategic Missile Squadron Launch Control Centers, which exercised primary control over the ERCS
2. The Minuteman missiles configured with ERCS payloads that were capable of accepting a voice recorded message of up to 90 seconds in length
3. The SAC airborne command post (ABNCP) ALCC-equipped aircraft which served as an alternate ERCS control agency.

Interface with ERCS hardware was provided by three modes:

• A land line through ground grouping points (North Bend, Nebraska and Red Oak, Iowa) allowed the airborne command post interface with 494L equipment^[12]
• A UHF radio link through the Launch Control Center to the Launch Facility
• A direct radio interface to the Launch Facility, through the Airborne Launch Control System

Headquarters Strategic Air Command had the ability to make inputs directly into the missile. The Numbered Air Forces could direct the missile crew to make the inputs. In the case of the airborne command post, inputs could be made directly into the missile and missile launch could be made from the aircraft.

Testing

Operational tests of the 494L Minuteman II ERCS were conducted by Air Force Systems Command and Strategic Air Command under the code name GIANT MOON. Launch Control Facility Oscar-1A (LCF O-1A) and Launch Facility Zero Four (LF-04) at Vandenberg AFB, California were modified in 1977 to perform ERCS-related test functions.

Blue Scout Jr ERCS Test Launches^[13]
Date	Launch Vehicle	Location	Apogee	Notes
		Vandenberg AFB, LC-A
		Vandenberg AFB, LC-A
		Vandenberg AFB, LC-A
		Vandenberg AFB, LC-A
		Vandenberg AFB, LC-A
		Vandenberg AFB, LC-A
		Vandenberg AFB, 4300C
Minuteman II ERCS Test Launches^[14]
Date	Launch Vehicle	Location	Apogee	Notes
		Vandenberg AFB, LF-05		First Minuteman ERCS test
		Vandenberg AFB, LF-05		Second Minuteman ERCS test
		Vandenberg AFB, LF-05		GIANT MOON 1, GLORY TRIP 16L
		Vandenberg AFB, LF-05		GIANT MOON 2, GLORY TRIP 40L
		Vandenberg AFB, LF-05		GIANT MOON 3, GLORY TRIP 200L
		Vandenberg AFB, LF-05		GIANT MOON 4
		Vandenberg AFB, LF-05		GIANT MOON 5
		Vandenberg AFB, LF-05		GIANT MOON 6
		Vandenberg AFB, LF-05		GIANT MOON 7
		Vandenberg AFB, LF-05		GIANT MOON 8

ERCS sortie location

After the system was declassified, the ten ERCS sorties were powered down and removed from their launch facilities. During these power-down operations, the location of the sorties were:

ERCS Sortie Locations
Launch Facility	Power Down Date	Payload Removal Date	Notes
F06
F07
I06
I11
M03			Missile Guidance System failed; was not replaced
M07
N04
N08
O05
O06

Material and support

The Ogden Air Materiel Area at Hill AFB, Utah was made the Systems Support Manager in August 1963.^[15]

Chronology

• 29 September 1961 – HQ USAF issues Specific Operational Requirement (SOR) 192, for ERCS (designated Program 279)
• 27 December 1961 – Interim configuration finalized of three rockets with 1 KW transmitters, stationed around Omaha, Nebraska; four sites with three rockets each
• 5 April 1962 – Amendment to SOR 192 to include two east coast ERCS complexes, based on CHROME DOME routes and SAC elements in Europe
• 21 September 1962 – SAC study recommends use of Minuteman missile, to eliminate Program 279 and its proposed expansion
• 7 June 1962 – SAC proposes changes to SOR 192, such as using six Minuteman missiles selected from among the flights of an operational wing; this was envisioned not to impair the alternative capability of substituting nuclear warheads should future circumstances warrant.
• 11 July 1962 – Program 279 attains Initial Operating Capability (IOC); UHF transmitter payloads attached to three MER-6A Blue Scout rockets at three sites near Wisner, West Point, and Tekamah, Nebraska
• 13 December 1966 – A Minuteman II launched from Vandenberg AFB, Calif. carried the first Minuteman ERCS payload into space for testing and evaluation^[16]
• 17 April 1967 – Third, and last, test of the ERCS using a Minuteman booster; Emergency Action Message was inserted into the transmitter from an ALCS aircraft.
• 15 August 1967 – First Program 494L payload arrives at Whiteman AFB, Missouri^[17]
• 10 October 1967 – First two Program 494L ERCS payloads put on alert at Whiteman AFB, Missouri; IOC obtained for Program 494L ERCS^[16]
• 1 January 1968 – Full Operational Capability (FOC) obtained for Program 494L ERCS; Program 279 ERCS inactivated by SAC^[17]
• 23 October 1974 – ERCS test, designated GIANT MOON 6, launched from Vandenberg AFB. Test was monitored on two frequencies by ground facilities. PACOM at Hickam AFB maintained valid reception of the JCS WHITE DOT ONE message for 22 minutes and another message for 14 minutes^[18]
• 27 September 1991 – President George H. W. Bush terminated SAC's alert force operations, which included taking Minuteman II ICBMs (including ERCS sorties) off-alert.

^[5]

In popular culture

ERCS is mentioned in by David Hoffman.^[19]

ERCS is mentioned in Arc Light by Eric Harry.

See also

• Dead Hand – Russia's version of ERCS, relaying launch codes instead of messages
• Post-Attack Command and Control System (PACCS)
• Airborne Launch Control System (ALCS)
• Ground Wave Emergency Network (GWEN)
• Minimum Essential Emergency Communications Network (MEECN)
• Survivable Low Frequency Communications System (SLFCS)
• Primary Alerting System (PAS)
• SAC Automated Command and Control System (SACCS)

Notes and References

1. Heacock . Phillip K. . The Viability of Centralized Command and Control (C²) . . 30 . 2 . 34–37 . January–February 1979 . 2022-07-14 . 1554-2505 . 1555-385X . 2002207178 . 50625917 . . dmy-all .
2. Web site: RE: Emergency Rocket Communications System Deactivation. 30 April 1991. Strategic Air Command History, 1 Jan – 31 December 1991. 8 December 2012 . .
3. Haverlah . Jeff . 2005-04-04 . 2 September 1998 . What is an EAM? . Monitoring Times . 0889-5341 . 91649214 . 925172081 . https://web.archive.org/web/20210517093909/http://www.monitoringtimes.com/html/eam.html . 2021-05-17 . live . 2022-07-14 . dmy-all .
4. Web site: Emergency Rocket Communications System . n.d. . . 2022-07-14 . https://web.archive.org/web/20211117224022/https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/196330/emergency-rocket-communications-system/ . 2021-11-17 . live . Each ERCS unit comprised two powerful UHF transmitters and was to be launched at a very high trajectory in place of a nuclear warhead on a Minuteman missile. ERCS could transmit nuclear orders or "go codes" to receivers within its line of sight -- bombers in flight and ground-based nuclear forces in the US and around the world -- for up to 30 minutes. . dmy-all .
5. . Strategic Air Command Weapon Systems Acquisition 1964–1979 . Report . 1980-04-28.
6. Web site: Emergency Rocket Communications System (ERCS) . 1998-04-29 . . live . 2022-07-14 . https://web.archive.org/web/20220606234916/https://nuke.fas.org/guide/usa/c3i/ercs.htm . 2022-06-06 . dmy-all.
7. Emergency Rocket Communications System: Emergency Action Procedures (Redacted) . limited . 1982-06-26 . SACR 55-45 . . X . 2022-07-14 . . dmy-all.
8. ERCS Deactivation Plan Input . . 1991-03-11 . 2022-07-14 . Scribd. limited . dmy-all.
9. McDowell . Jonathan . Jonathan McDowell . Scout, and Blue Scout Jr. . 533 . 2004-08-27 . . 2022-07-15 . https://web.archive.org/web/20220704231502/https://www.planet4589.org/space/jsr/back/news.533.txt . 2022-07-04 . live . dmy-all .
10. The Danger of Nuclear Diplomatic Decapitation . Howard . Tamashiro . . 1554-2505 . 1555-385X . 2002207178 . 50625917 . September–October 1984 . 35 . 6 . 74—79 . 2022-07-14 . . dmy-all.
11. Web site: Boeing LEM-70 Minuteman ERCS . Andreas . Parsch . 2002 . Directory of U.S. Military Rockets and Missiles . designation-systems.net . 10 January 2011. https://web.archive.org/web/20101215173052/http://designation-systems.net/dusrm/m-70.html. 15 December 2010 . live.
12. Post Attack Command and Control System overview . limited . SWVA-69-098 . Report . 2022-07-15 . . dmy-all.
13. Web site: Scout . n.d. . . https://web.archive.org/web/20220318074822/http://www.astronautix.com/s/scout.html . 2022-03-18 . live . 2022-07-21 . dmy-all.
14. Web site: Vandenberg LF05 . n.d. . . https://web.archive.org/web/20220303072352/http://astronautix.com/v/vandenberglf05.html . 2022-03-03 . live . 2022-07-21 . dmy-all.
15. Web site: Allied Signal Emergency Rocket Communication System . n.d. . 2022-07-15 . . en-us . https://web.archive.org/web/20210422192155/https://www.hill.af.mil/About-Us/Fact-Sheets/Display/Article/397090/ercs-system/ . 2021-04-22 . live . dmy-all.
16. Web site: History Milestones Friday, January 01, 1960 - Wednesday, December 31, 1969 . n.d. . dead . . en-us . https://web.archive.org/web/20090613132242/http://www.af.mil/information/heritage/milestones.asp?dec=1960&sd=01/01/1960&ed=12/31/1969 . 2009-06-13 . dmy-all .
17. Space and Missile Center: Space and Missile Systems Organization History (Volume 2), 1 Jul 1967 – 30 Jun 1969
18. . 1975-09-25 . Chapter VI, Section I: Command and Control Emergency Rocket Communications System Test . CINCPAC Command History 1974 . 1 . 341 . . PDF . en-us . 2022-07-14 . dmy-all.
19. Book: Hoffman . David . 2009-09-22 . The Dead Hand: The Untold Story of the Cold War Arms Race and its Dangerous Legacy . en . . 978-0385524377 . 2009016751 . 692286900 . OL27876820M . . dmy-all.