The military service chiefs have approved a key guidance document describing how field commanders should promote U.S. interests worldwide during peacetime in an attempt to preclude future American military intervention, Pentagon officials tell InsideDefense.com . The four-star officers approved the document, titled "Military Contribution to Cooperative Security," and drafted by U.S. Joint Forces Command and U.S. European Command officials, on March 28. Officials are now awaiting the approval of Adm. Michael Mullen, the chairman of the Joint Chiefs, and Defense...