Answer:
The Joint Task Force, also called JTF, is a joint force that is constituted and so designated by the Secretary of Defense, a combatant commander, a subordinate unified commander, or an existing Joint Task Force commander. [...]
The concept of a joint ad hoc military formation emerged in the 1920s and 1930s with the U.S. Navy. However, "combined" is also used in the British-American term to designe multi-national forces such as the CCTF -Commander Combined Task Force- or CJTF -Combined Joint Task Force.
