S.H.A.P.E.

Supreme Headquarters Allied Powers Europe. Now there's an acronym we weren't expecting to be associated with shapes.

From the Wikipedia:

Supreme Headquarters Allied Powers Europe (SHAPE) is the central command of NATO military forces. It is located at Casteau north of the Belgian city of Mons.
Initially SHAPE was headquarters of operational forces in the European theatre (Allied Command Europe, ACE), but from 2003 SHAPE is the headquarters of Allied Command Operations (ACO) controlling all allied operations worldwide. The former Allied Command Atlantic (ACLANT) headquarters in Norfolk, Virginia was simultaneously converted into headquarters for the new Allied Command Transformation (ACT) responsible for transformation and training of NATO forces. SHAPE retained its traditional name with reference to Europe although the geographical scope of its activities were extended in 2003. The commanding officer of Allied Command Operations has also retained the title "Supreme Allied Commander Europe" (SACEUR), and continues to be a U.S. four star general with the dual-hatted role of Commander, U.S. European Command.
The main (political) headquarters of NATO is located in the Evere area of the Brussels-Capital Region about 80 km (50 miles) from SHAPE.