The Army Aviation Heritage Foundation restores Vietnam-era helicopters . A new generation of military choppers is being built in the United States to replace aging UH-1Ns and CH-47s that have been used for decades but are now too expensive or difficult to maintain. Copters offer rides at airshows around the country .
The Army Aviation Heritage Foundation restores Vietnam-era helicopters . Huey 354 bears scar of combat in Vietnam . Copters offer rides at airshows around the country .