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Sea of Tranquility Conflict

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Sea of Tranquility Conflict
LocationSea of Tranquility, Luna
DateBefore 2077
Involved parties
United States of AmericaUSA Flag Pre-War.png United States of AmericaOther space-flight capable nations

The Sea of Tranquility Conflict was a United States military campaign that was instigated from an unknown party based on the moon at an unknown timeline before the Great War. The purpose of this campaign is currently inconclusive, as well as its conclusion.


This mural commemorates the many sacrifices of the brave men and women of the United States Armed Forces.

From Lexington and Concord to the shores of Iwo Jima, from the Sea of Tranquility to the Anchorage Front Line, Americans have fought and died through the ages to secure our nation’s freedom.

May their sacrifices remind us all that freedom is a privilege afforded to the many, yet hard won by a noble few.

– Mural at the Museum of Freedom, Concord[1]


Information regarding this campaign comes from an inscription on a mural, listing various locales where America had fought in the defense of freedom. This particular mural can be found inside of the Museum of Freedom in Concord.


The Sea of Tranquility Conflict is mentioned only in Fallout 4.

Behind the scenes

Mare Tranquillitatis is a lunar mare (a large basaltic plain) on the moon.