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You don't want to be the bad guy on the ground when this Fairchild Republic Thunderbolt II A-10 "Warthog" is patrolling overhead.  If you are the bad guy, though, don't bother shooting up at it with anything less than a surface-to-air missile because its belly is made of thick titanium.

The front mounted gun is a General Electric GAU-8/A Avenger 30 mm seven-barrel "Gatling gun" cannon which fires depleted uranium bullets at up to 4200 rounds per minute.  If that doesn't kill you then the pilot might try an AGM-65A Maverick missile or a Mk 84 laser-guided bomb.  The A-10 "Warthog" is planned to be in active service through 2030.