Lockheed Martin Information Systems & Global Services, Colorado Springs, Colorado, has been awarded a $24,191,749 modification (P00313) exercising an option to contract F19628-00-C-0019 to support critical mission operations for North American Aerospace Defense Command's Cheyenne Mountain Complex/Integrated Tactical Warning/Attack Assessment (NCMC/ITWAA) in support of air, missile and space defense for the national command authority. This sustainment effort encompasses operations, maintenance and support to maintain mission integrity for the target system architecture systems at Cheyenne Mountain Air Force Station Colorado, the Alternate Mission Command Center, and forward user and sensor sites, as well as maintenance of legacy systems at the Peterson Air Force Base, Colorado; Test Development Facility, Space Training System and Joint Space Operations at Vandenberg Air Force Base, California; and the Integrated Space Command and Control Test and Integration Lab in Colorado Springs, Colorado. Also included is the 721st Cheyenne Mountain Communications Squadron (A-76) support. Work will be performed at Colorado Springs, Colorado, and Vandenberg Air Force Base, California, and is expected to be completed by Sept. 29, 2015. Air Force Life Cycle Management Center/HBQK, Peterson Air Force Base, Colorado, is the contracting activity.