The Defense Department said Tuesday the modification exercises option period one and work will occur in Arlington, Virginia through March 31, 2019.
The Army Contracting Command will obligate $2.6 million at the time of award from fiscal 2017 research, development, test and evaluation funds.
CACI secured a five-year, $159 million prime contract in 2015 to help the Army develop and implement IPPS-A.
IPPS-A is a web-based human resource system that will work to provide personnel and pay functions across the service branch.