Which subordinate organization is aligned under the Air Force installation and mission support center (AFIMSC)?

The Air Force Civil Engineering Center (AFCEC) is the correct answer as it serves as a subordinate organization under the Air Force Installation and Mission Support Center (AFIMSC). The AFIMSC is responsible for providing support to the entire Air Force installation and mission support enterprise, focusing on areas such as civil engineering, logistics, and other critical functions necessary for operational readiness.

AFCEC plays a vital role in the execution of civil engineering programs and provides technical expertise in various areas such as planning, designing, and construction management. By being aligned under the AFIMSC, AFCEC ensures that civil engineering capabilities are integrated effectively into broader mission support efforts, enhancing the Air Force's overall operational efficiency.

The other organizations listed in the options, while essential components of the Air Force, fall under different commands and structures that do not align them directly under the AFIMSC. This distinction highlights the unique role that AFCEC plays in supporting the infrastructure and operational needs of the Air Force.