aircraft. remember, american officials said isis fighters have taken down hundreds, include ak-47s. and that's on top of the vehicles they already have. in ft, they're talking about the humvees. retired gunnery jesse james dunst joins now. thank you for being with us. >> thank you, harris. >> first of all, what can you tell us about those hand-held rocket-propelled grenades they have? >> well, essentially, the rocket-propelled grenades can be used multiple time and shoulder carried can penetrate armored vehicles. they're usually used for anti-tank weaponerry or armiered personnel vehicles. essentially if you're going