Case–Shiller index; the statistic is published by Standard & Poor's and is also a component of S&P's 20-city composite index of the value of the U.S. residential real estate market. Avionics, defense, and marine electronics The University of South Florida's Center for Ocean Technology, which has been a leader in microelectromechanical systems research and development and has been using the technology to collect biological and chemical data to monitor water quality, provided underwater technology for port security at the 2004 Republican National Convention. USF's Center for Robot-Assisted Search and Rescue used its miniature robots to assist rescue teams at Ground Zero following the September 11 terrorist attacks. Tampa Bay is also the location of three major military installations, MacDill Air Force Base, Coast Guard Air Station Clearwater and Coast Guard Station St. Petersburg. MacDill AFB is home to the 6th Air Mobility Wing (6 AMW) of the Air Mobility Command (AMC) and the 927th Air Refueling Wing (927 ARW) of the Air Force Reserve Command (AFRC). Both wings share flight operations of a fleet of KC-135R Stratotanker aircraft and the 6 AMW also operates a fleet of C-37A Gulfstream V aircraft. MacDill AFB also hosts multiple tenant organizations, to include two major combatant commands: United States Central Command (USCENTCOM), which directs military operations in Afghanistan, Iraq, and the Middle East; and United States Special Operations Command (USSOCOM), which has responsibility for all special operations forces in the U.S. Armed Forces. CGAS Clearwater is located at the St. Petersburg–Clearwater International Airport. It is the largest air station in the United States Coast Guard, operating HC-130H Hercules aircraft and MH-60T Jayhawk helicopters with principal missions focused on search and rescue, counternarcotics interdiction, and homeland security. The HC-130 aircraft are slated to be replaced by new HC-27J Spartan aircraft beginning in 2017. Coast Guard Station St. Petersburg is located on the site of the former Coast Guard Air Station St. Petersburg at Albert Whitted Airport. It is home to Coast Guard Sector St. Petersburg and is homeport for the USCGC Resolute (WMEC 620), USCGC Venturous (WMEC 625), and numerous smaller cutters and patrol boats. Education Primary and secondary education is provided by the school districts of the individual counties making up the region. The area is home to several institutions of higher learning, including the main campus of the University of South Florida in Tampa and its satellite campus in St. Petersburg. Eckerd