S-01 S-02 S-03 S-04 S-05 S-06 S-07 S-08 S-09 S-10 S-11

Minuteman Launch Facility S-11 (Sierra-11 LF), Yoder Wyoming

Latitude: 41.922541
Longitude: -104.382891

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Site Type: Missile Launch Facility - Silo
A LF consists of a launcher and an associated launch facility support building (LFSB). All facilities are enclosed within a security fence. The sites average about 1.6 acres in size and holds one missile.

Missile Type: LGM-30B Minuteman I; LGM-30G Minuteman III; LGM-118A Peacekeeper

Parent Base: F.E. Warren AFB

Missile Wing: 90th Missile Wing; 90th Strategic Missile Wing during SAC era

Missile Squadron: 400th Missile Squadron (former Peacekeeper-converted field)

Permanent Installation Number: 9235

Installation Location Code: GHZS

Missile Activated: June, 1965


Missile Deactivated September 19, 2005


Current Site Use: Former Minuteman / Peacekeeper launch facility; missile removed; site included in New START-era Peacekeeper silo-elimination planning; present parcel-level reuse not verified.

Site Ownership: Former U.S. Air Force missile-field property; post-disposal parcel ownership not verified.

Accessible: No public access confirmed; view only from public roads where legal; do not enter the property without current owner permission.

How the Peacekeeper Missile Worked

Map showing location of Minuteman Launch Facility S-11, Wyoming
Map 1: Showing location of Minuteman Launch Facility S-11, Wyoming

Map Showing Street Level location of Minuteman Launch Facility S-11, Wyoming
Map 2: Showing Street level location of Minuteman Launch Facility S-11, Wyoming

S-11 was one of Sierra Flight's unmanned launch facilities: a small, hardened missile site whose surface footprint was deliberately plain, but whose Cold War role was tied to the crewed S-01 Missile Alert Facility and Launch Control Center. Public records place Launch Facility S-11 in Goshen County, Wyoming, near Yoder. A public Peacekeeper field photo listing identifies the site as Francis E. Warren AF Missile Site S-11, PIN 9235, ILC GHZS, with a DMS coordinate of 41-55-22, 104-22-59.

S-11 belonged to F.E. Warren Air Force Base's Minuteman missile field, first under the 90th Strategic Missile Wing in the SAC era and later under the 90th Missile Wing. Its Peacekeeper-era squadron was the 400th Missile Squadron. The parent control site for Sierra Flight was S-01 Missile Alert Facility / Launch Control Center. S-11 is no longer an active missile facility. The Peacekeeper mission at F.E. Warren ended on 2005-09-19, and the former Peacekeeper launch facilities were later included in New START-era silo-elimination planning.

S-11 occupied open rural land in Goshen County, Wyoming, in the Yoder area. No public access was confirmed.

S-11 was a launch facility, not a crewed command post. Missile crews served at S-01, while maintenance, communications, and security teams visited S-11 as needed. Public exterior photos from 2013 provide general views of the former launch facility area,

S-11 began as a Minuteman launch facility in the F.E. Warren missile field and later passed through the Minuteman III-to-Peacekeeper conversion that affected 50 former Minuteman silos assigned to the Peacekeeper force. Official Air Force history states that the Peacekeeper became operational at F.E. Warren in 1986, that 50 missiles were in service there by 1988, and that the missiles were placed in hardened underground silos previously used by Minuteman ICBMs.

S-11 is a decommissioned former Minuteman / Peacekeeper launch facility. The missile is gone, and the site was part of the broader New START disposal framework for former Peacekeeper launch facilities at F.E. Warren. Parcel-level current ownership and reuse were not verified. The site should be treated as private or restricted property unless current land records or posted access information show otherwise.

For the full Sierra Flight narrative, see S-01 Missile Alert Facility / Launch Control Center

Cronology

  • 1963 - The 90th Strategic Missile Wing was activated at F.E. Warren during the Minuteman buildup.
  • 1965-06 - The F.E. Warren Minuteman force was in the fully operational era; S-11 belonged to the Sierra Flight launch-facility network.
  • 1975 - Minuteman III replaced Minuteman I at F.E. Warren.
  • 1986 - The Peacekeeper became operational at F.E. Warren.
  • 1988 - Fifty Peacekeeper missiles were in service at F.E. Warren.
  • 2005-09-19 - The Peacekeeper mission at F.E. Warren ended.
  • 2007-06 - A Tank Closure Report for Launch Facility Sierra-11, F.E. Warren AFB, Wyoming, was listed in the 2013 silo-elimination environmental assessment bibliography.
  • 2011-02-05 - New START entered into force.
  • 2013 - The Final Environmental Assessment for Minuteman III and Peacekeeper Silo Elimination addressed former Peacekeeper launch facilities and associated missile alert facilities at F.E. Warren.
  • 2013-08-18 - Public photographs of S-11 were published in the AirForceBase.net Peacekeeper field photo set.
  • 2018-02-04 - New START required covered silo-elimination work to be completed by this date.

Current Google Satellite Image of Minuteman Launch Facility S-11, Wyoming
Aerial View 1: Current Google Satellite Image of Minuteman Launch Facility S-11, Wyoming Source: Google Maps - Click to View
Map Showing Sierra Flight Missile Silos & MAF Locations
Map 3: Map Showing Sierra Flight Missile Silos & MAF Locations Red Marker Shows Sierra-11 LF Location, Black Show MAF Location, Grey Shows the other Silos in the Flight

Read about the Peacekeeper Missile at F.E. Warren AFB

All Peacekeeper Missile Silo Locations

All Minuteman/Peacekeeper Missile Silo Locations