The CH-47 Chinook now has multiple variants that are all used in militaries from 22 countries, including the U.K. and Japan. Boeing still produces new ones.

It is a twin-turbine engine, tandem-rotor helicopter designed for transporting cargo, troops and weapons in various environments, including day, night, visual and instrument conditions.

The CH-47 Chinook has been doing service in for decades now, thanks to its capabilities. Is the military planning to replace it with a new type of helicopter?

Stanley Gorlo of Stratford looks at a Lycoming T55-L-5 gas turbine Chinook helicopter engine at an exhibit the National Helicopter Museum in Stratford on Thursday, August 18, 2011.

Turbine Power Technology buys the old turbine engines, that once powered Chinook and Huey helicopters, and, using a team of military veterans, restores them and converts them to run on natural gas ...