The Chinook first flew in 1962 and the CH-47F upgrade was completed in 2006.
"The Boeing Co., Ridley Township, Pennsylvania, was awarded an $896.9 million modification... contract for cargo (CH-47F) helicopter[s] multiyear for production lot 14 for 27 renew helicopters and 12 new build helicopters," the announcement stated on Tuesday.
The CH-47 Chinook is a US twin-engine, tandem rotor heavy-lift helicopter. Its primary roles are troop movement, artillery placement and battlefield resupply.