Twenty-First Air Force & U.S. Air Force Expeditionary Center

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

Airmen with the 571st Mobility Support Advisory Squadron receive a briefing from U.S. Coast Guard guardsmen, Dec. 5, 2024, San Francisco, California. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds coverage of more than 49 square miles, 100 personnel involved and contributions from more than 17 different agencies and organizations. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

The U.S. Coast Guard was established in 1963. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds coverage of more than 49 square miles, 100 personnel involved and contributions from more than 17 different agencies and organizations. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

The U.S. Coast Guard and U.S. Air Force Airmen with the 571st Mobility Support Advisory Squadron pose for a photo in San Francisco, California, Dec. 5, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds coverage of more than 49 square miles, 100 personnel involved and contributions from more than 17 different agencies and organizations. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

The U.S. Coast Guard and U.S. Air Force Airmen with the 571st Mobility Support Advisory Squadron prepare for boat tour of San Francisco, California, Dec. 5, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds coverage of more than 49 square miles, 100 personnel involved and contributions from more than 17 different agencies and organizations. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

U.S. Air Force Lt. Col. Mary Lea Bordelon, left, 571st Mobility Support Advisory Squadron commander, and U.S. Air Force Lt. Col. Nicholas Rapp, right, 571st MSAS director of operations, pose for a photo in San Francisco, California, Dec. 5, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

San Francisco Sheriff's Office Lt. Rebecca Lee, SFSO lieutenant of Homeland Security, briefs her team during Exercise Sourdough in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

Sgt. Tim Conway, San Francisco Sheriff's Office field training officer, makes a dispatch during Exercise Sourdough in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

A U.S. Coast Guard boat awaits passengers during Exercise Sourdough, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

The Golden Gate Bridge in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

A U.S. Coast Guard guardsman performs an in-flight safety check during Exercise Sourdough in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

Air advisors with the 571st Mobility Support Advisory Squadron radio in a dispatch to their team members during Exercise Sourdough in San Francisco, California, Dec. 5, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

U.S. Coast Guard guardsmen take off during Exercise Sourdough in San Francisco, California, Dec. 5, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

A U.S. Coast Guard guardsman awaits to receive passengers during Exercise Sourdough in San Francisco, California, Dec. 5, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

Air advisors with the 571st Mobility Support Advisory Squadron, bottom left, radio in a dispatch to their team members during Exercise Sourdough in San Francisco, California, Dec. 5, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

Air advisors with the 571st Mobility Support Advisory Squadron evaluate dispatch to their team members during Exercise Sourdough in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

U.S. Air Force Staff Sgt. Dylan Sanchez, 571st Mobility Support Advisory Squadron air advisor, points out a MSAS team on a map during Exercise Sourdough in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

U.S. Air Force Staff Sgt. Dylan Sanchez, middle, 571st Mobility Support Advisory Squadron air advisor, points out a MSAS team on a map during Exercise Sourdough in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

U.S. Air Force 1st Lt. Joel Sanchez-Rosado, 818th Mobility Support Advisory Squadron weapons and tactics deputy chief, updates a communications check white board during Exercise Sourdough in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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571st MSAS, SFSO lead Exercise Sourdough: DoD's largest urban ev

U.S. Air Force 1st Lt. Joel Sanchez-Rosado, 818th Mobility Support Advisory Squadron deputy chief of weapons and tactics, updates a communications check white board during Exercise Sourdough in San Francisco, California, Dec. 4, 2024. Exercise Sourdough is the Department of Defense's largest urban evasion exercise, which exceeds more than 49 square miles of land coverage, 100 personnel involved and contributions from 17 different agencies. (U.S. Air Force photo by Staff Sgt. Scott Warner)

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Agile Combat Employment (ACE)

AF Doctrine Note 1-21 Agile Combat Employment (ACE): a proactive and reactive operational scheme of maneuver executed within threat timelines to increase survivability while generating combat power. Current As Of: 23-August-2022

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