3. The command structure is lean and the management system is large. The office of the secretary of defense, the department of defense's main military administration, has 16 operational departments, offices (the united states department of defense's senior research and planning bureau, the bureau of ballistic missile defence organizations, the defence support agency, the defence contracts audit office, the defence finance bureau, the defence information system bureau, the defence intelligence agency, the defence investigation agency, the defence legislation authority, the defence logistics bureau, the defence mapping department, the defence nuclear weapons authority, the defence security assistance agency, the on-site verification agency, the central image office, the state secret service and the central secret service). Of these, the defence logistics department alone has over 47,000 members, the defence mapping agency has over 8,400 members and the defence intelligence agency over 4,300. The ministries of military sciences also have a ministerial office and related operational departments with similar responsibilities to those of the ministry of defence and a larger staff, such as the 31 operational administrations under the ministry of the army, with more than 4,100 staff. The ministry of the navy has 59 administrative departments with more than 2,800 staff. The department of the air force has 23 management departments with over 3,400 staff. The marine corps comprises 33 administrations and has over 510 staff. The number of military staff is also relatively large. The operational chain of command, the joint chiefs of staff, is smaller than the office of the ministry of defence and the ministry of the three forces. The composition is composed of the chairman of the joint chiefs of staff and the vice-chairman of the joint chiefs of staff (the army chief of staff, the navy chief of operations, the air force chief of staff and the commander-in-chief of the marine corps), with approximately 1,000 staff. Its main bodies are the ministry of manpower and personnel, the ministry of intelligence (defence intelligence), the ministry of operations, the ministry of logistics, the ministry of strategic planning and policy, the ministry of command and control of communications and planning, the ministry of operational planning and operations, and the ministry of force resources and assessment. The joint operations command and the single military command are also poorly staffed, generally between 200 and 600。
