The task orders come under the department's Tactical Communications Equipment and Services contract, which has been given to 30 companies.
The contract is an indefinite-delivery/indefinite-quantity award with a two-year base period and three one-year options.
"This award gives Unisys an opportunity to provide mission-critical tactical communications systems support services to a broad range of federal agencies," said Marty Mackes, vice president for Homeland Security, Unisys Federal Systems. "We look forward to helping to guide (Homeland Security) into the future of tactical communications."
Unisys said it will compete for task orders in two of five categories: infrastructure services and operations and maintenance services.
The task orders would come not only from Homeland Security and its agencies but also from White House, the Department of the Interior, Justice Department and State Department.