The 11th Infantry Brigade and Headquarters South East is a regular British Army brigade formation that is part of the Army's 'Adaptable Force' meaning it has operational units under command, as well as regional responsibilities across the South East of England. The Brigade was re-established on 1 August 2014 when 145 (South) Brigade was re-designated as Headquarters 11th Infantry Brigade. In December 2014 the brigade merged with 2 (South East) Brigade to form Headquarters 11th Infantry Brigade and Headquarters South East. 11th Infantry Brigade is also regionally aligned with the southern and eastern African region as part of defence engagement.