 It has been the most comprehensive reorganization since World War II and included modular combat brigades, support brigades, and command headquarters, as well as rebalancing the active and reserve components.The plan was first proposed by the Army's 34th Chief of Staff, Eric Shinseki, in 1999, but was bitterly opposed internally by the Army.By 2020, the Army's 40th Chief of Staff was calling for transformational change, rather than incremental change by the Army.