In fiscal years 2007–2009, the Army Reserve was realigned into a functional command structure. The majority of Army Reserve units are now assigned to operational and functional commands. Operational commands are deployable elements which command deployable units of the same or similar capabilities regardless of peacetime geographic location. For instance, the 377th Sustainment Command (Theater) commands all Army Reserve sustainment units, while the 11th Aviation Command commands all Army Reserve aviation assets. Likewise, functional commands are responsible for command of units of the same or similar capabilities regardless of peacetime geographic location, but are not, as a headquarters, deployable.