Oath of Office Chairman of the Joint Chiefs of Staff Army Gen. Mark A. Milley administers the oath of office to Senior Enlisted Advisor to the Chairman of the Joint Chiefs of Staff Ramon "CZ" Colon-Lopez at Joint Base Myer-Henderson Hall, Va., Dec. 13, 2019. With Colon-Lopez is his wife, Janet. SHARE: Download: Full Size (1.42 MB) Tags: chairman, seac Credit: Navy Petty Officer 1st Class Dominique A. Pineiro, DOD VIRIN: 191213-D-PB383-003Y.JPG Photo Gallery