The AF uses muscle cars to chase it down the runway as it lands to give the pilot feedback on their height above the concrete. They have to stall it from 2 feet up (61cm) to have a successful landing. If they do it from 4 feet up (1.2m), they'll probably damage something.
They used to use Pontiac GTOs (aka Holdens), then switched to Camaros. Not sure what they're using now.