This book provides a background and analysis comparing military commissions as envisioned under the MCA to the rules that had been established by the Department of Defense (DOD) for military commissions and to general military courts-martial conducted under the UCMJ. After reviewing the history of the implementation of military commissions in the "global war on terrorism," this book provides an overview of the procedural safeguards provided in the MCA. This book identifies pending legislation, including H.R. 267, H.R. 1585, H.R. 2543, H.R. 2826, S. 1547, S. 1548, H.R. 1416, S. 1876, S. 185, S. 576, S.447, H.R. 1415 and H.R. 2710. Finally, the book provides two tables comparing the MCA with regulations that had been issued by the Department of Defense pursuant to the President's Military Order with standard procedures for general courts-martial under the Manual for Court-Martial. The first table describes the composition and powers of the military tribunals, as well as their jurisdiction. The second chart, which compares procedural safeguards required by the MCA with those that had been incorporated in the DOD regulations and the established procedures in courts-martial, follows the same order and format used in CRS Report RL31262, Selected Procedural Safeguards in Federal, Military, and International Courts, to facilitate comparison with safeguards provided in federal court and international criminal tribunals.