104 Theatre Sustainment Brigade is a specialist logistic support formation of the British Army. The brigade is the only one of its kind, and as such contains many of the special units of the Royal Logistic Corps and Royal Electrical and Mechanical Engineers.

The Allied Rapid Reaction Corps (ARRC) is a rapid reaction force maintained by NATO. It is capable of deploying a High Readiness Force (Land) Headquarters at short notice for operations and crisis response.