4-26. A BSI is a Service or DOD agency installation within the homeland tasked to serve as a base for military forces engaged in DSCA or homeland defense. The Secretary of Defense may direct the Service secretaries to place selected installations in a support relationship to the combatant command. In the USNORTHCOM AOR, the Commander, USNORTHCOM, will designate an installation as a BSI, with owning Service concurrence and approval of the Secretary of Defense (or designee). A BSI provides common user logistic support and assists a joint task force with JRSOI of responding DOD forces. A BSI generally is located near an airfield and suitable support facilities close to an incident. The BSI may also become the aerial port of debarkation and JRSOI facility for federal military forces. In addition to JRSOI, the BSI may become a training facility and principal supporting base for the federal government (nonmilitary) relief efforts. If a suitable DOD installation is not nearby, USNORTHCOM will go to General Services Administration for a potential installation. Commanders and staffs conduct mission analysis to plan for logistic requirements.