The tooth-to-tail ratio (T3R), in military jargon, is the number of

military personnel Military personnel or military service members are members of the state's armed forces. Their roles, pay, and obligations differ according to their military branch (army, navy, marines, coast guard, air force, and space force), rank ( office ...

it takes to supply and support ("tail") each combat

soldier A soldier is a person who is a member of an army. A soldier can be a Conscription, conscripted or volunteer Enlisted rank, enlisted person, a non-commissioned officer, a warrant officer, or an Officer (armed forces), officer. Etymology The wo ...

("tooth"). While both "tooth" and "tail" soldiers may find themselves in combat or other life-threatening situations, and both may spend much time in non-combat duties, "tooth" soldiers are those whose primary function is to engage in combat. The ratio is not a specific measure but rather a general indication of a force's might in relation to the resources it devotes to supply, upkeep, and

logistics Logistics is the part of supply chain management that deals with the efficient forward and reverse flow of goods, services, and related information from the point of origin to the Consumption (economics), point of consumption according to the ...

. It may be measured for an entire national military, a single branch, a theater of operations, or down to individual formations. Tooth-to-tail ratio is often inversely related to its technological capabilities and subsequently its overall power. While a force with a high tooth-to-tail ratio will have more personnel devoted to combat, these soldiers will lack the support provided by the tail. Such support includes the logistics and communication infrastructure on which modern forces depend. A force with a higher tooth-to-tail ratio may have more combat troops, but each will be less effective. The tooth-to-tail ratio of the

US military The United States Armed Forces are the military forces of the United States. U.S. federal law names six armed forces: the Army, Marine Corps, Navy, Air Force, Space Force, and the Coast Guard. Since 1949, all of the armed forces, except th ...

has varied widely in its different conflicts.

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*Den Beste, Steven (May 19, 2003)
"The Digital Warrior: A tribute to the men who make the Information Age military work"

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Further reading