Joint base A joint base ( JB ) is a base of the United States military where multiple military services utilize the base with one service that serves as the host and one or more other services as tenants on the base . In most cases , the Joint Bases have inter - service support agreements ( ISSAs ) to govern how the host provides services to the tenant ( s ) . The practice originated during Base Realignment and Closure in 1993 , where Joint Reserve Bases were established at Willow Grove , PA and Fort Worth , TX . Base Realignment and Closure , 2005 added to this list when 26 bases were combined into twelve and renamed as Joint Bases . In addition , several other uses of the term " joint " are used in names of bases in the United States military and are described below . BRAC 1993 Joint Reserve Bases . JRBs at Willow Grove , PA and Fort Worth , TX were created during BRAC 1993 ; however , the term " Joint Reserve Base " was not used in the BRAC law . Instead , it realigned several reserve air assets to Carswell AFB ( now NAS JRB Fort Worth ) and NAS Willow Grove . It is not clear how or when these bases acquired the “ Joint Reserve Base ” name . The JRBs are examples of typical military host - tenant relationships , where support provided to the tenants by the host are codified in an Interservice Support Agreement ( ISSA ) as dictated by DOD Policy . At NAS JRB Fort Worth , the Navy hosts a variety of reserve flying units from the Navy , Marine Corps , and Air Force and each has an ISSA with the Navy for the support it needs at the base . BRAC 2005 Joint Bases . The joint basing program , established by recommendation 146 of the 2005 Base Closure and Realignment Commission , represents the department ' s efforts to optimize the delivery of installation support across the services . The BRAC Report created 12 joint bases from 26 service installations that were in close proximity or shared a boundary . As of 1 October 2010 , all 12 joint bases achieved full operational capability . Supporting and Supported Component Agreements . Joint Basing is not governed by the standard host - tenant ISSA policy , DODI 4000 . 19 . Joint Basing is instead governed by a Memorandum of Agreement between each joint base ' s supporting component , who provides installation support , and supported components , who receive installation support . BRAC 2005 law identified the supported component by requiring that their base realign the " relocating the installation management functions to " the supporting component . Guidance developed by OSD in 2008 required that the supporting and supported components complete a memorandum of agreement defining the installation support relationship between them for forming the joint base and to fully implement the BRAC 2005 joint basing decisions , and that the supporting component deliver installation support in accordance with the new definitions and standards . Resources then were transferred from the supported component ( s ) to the supporting component in the fiscal year 2010 President ’ s Budget submittal to align resources with responsibility for installation support at the joint bases . Common Output Level Standards . The joint basing program represents the Department of Defense ( DoD ) efforts to optimize the delivery of installation support across the services . DoD developed common output level standards ( COLS ) to provide common output or performance level standards for installation support . The framework of COLS will provide a common language to serve as a basis for ( 1 ) developing common output levels for each function of installation support at joint bases and ( 2 ) developing service - wide capability - based planning models for all installation support functions . OSD ' s 2008 guidance on implementing joint basing established a set of installation support functional areas and provided for the creation of a set of joint base common standards to define the level of service expected to be provided at each joint base and in order to ensure consistent delivery of installation support services . As of April 2012 , there were 280 joint base common standards grouped into 48 functional areas . List of Joint Bases . Not all of the joint bases were mandated by BRAC 2005 law to establish themselves as a joint base ; however , all 12 joint bases took on that title or a variation of it . Joint Base Balad . In addition to the above bases , Joint Base Balad was created as part of a combination of bases in Iraq . It was handed over to the Iraqi Air Force in 2011 , as the United States military withdrew from the nation . Joint Base Balad operated under the direction of CENTCOM . Two authorities provided support to tenants : the base operations support integrator ( BOS - I ) and the senior airfield authority ( SAA ) . The U . S . Air Force was the host at Joint Base Balad serving as both the BOS - I and SAA . No host - tenant agreement with the Army or other tenants of Joint Base Balad were needed , as it was CENTCOM policy for the BOS - I and SAA to advocate on behalf of all tenants . Joint Base Cape Cod . Although not officially named by the United States Department of Defense , local leaders on Cape Cod the state of Massachusetts renamed the Massachusetts Military Reservation to Joint Base Cape Cod in 2013 , reflecting its many operational tenants . Joint Systems Manufacturing Center . The Joint Systems Manufacturing Center is not a traditional joint base with a host and tenant . It is a government owned contractor operated ( GOCO ) site that changed its name from Lima Army Tank Plant to reflect the reflect the “ jointness ” of the facility in working for the Army , Marine Corps and the Navy .