11th Signal Regiment, Italian Army Warrent Officer Alberto Cerica adjusts the satellite signal during inclement weather on May 8, 2006 FOS Eagle, Tuzla Bosnia in support of Combined Endeavor 2006 (CE), United States European Command (USEUCOM) exercise is “in the spirit of” the Partnership for Peace (PfP) C4 Integration and Interoperability Exercise. CE enables interoperability between U.S. and NATO / PfP military C4 equipment by documenting and exercising technical and procedural solutions.