2-6. Through assignment or allocation of Army forces to a GCC by the Secretary of Defense, the theater army may exercise operational control (OPCON) (or other delegated command authority) of Army forces until the combatant commander attaches those forces to another subordinate Service or joint command. OPCON provides authority to organize and employ commands and forces as the commander considers necessary to accomplish missions. It does not include authoritative direction for logistics or matters of administration, discipline, internal organization, or unit training. (See appendix A for a discussion of command and support relationships).