The U.S. Air Force ordered eight additional Reaper aircraft from General Atomics Aeronautical Systems Inc., the Pentagon announced on May 20.

Under the $72.1 million contract modification, GA-ASI will deliver eight MQ-9 Reapers in the Block 5 configuration. Poway-based General Atomics Aeronautical is expected to complete the order by December 2017.

The Reaper is a heavier version of the original GA-ASI Predator, which the Air Force no longer orders.

The Air Force Life Cycle Management Center at Wright-Patterson Air Force Base in Ohio placed the order.

Pentagon contracts come in several varieties. A Defense Department announcement described this particular order as “fixed-price incentive firm and firm-fixed price.”