up, and then dives down on the tank. >> it will come in on the target from a high angle of attack and hit the roof of the tank where the armor is very thin. >> reporter: the u.s. is one of 15 countries ships tens of thousands of antitank weapons to ukraine. you can see the ukrainian soldiers carrying them into combat. not all of them are are as sophisticated and deadly as the javelin, but in the right hands, a rocket-propelled grenade can disable a tank. >> reporter: you'll get what's called a mobility kill, which means the tank may not be completely destroyed, but it will not be able to move and it can be targeted with other weapons at that point. >> reporter: what's it like to go up against a tank when you're on foot? >> it's very, very terrifying for an infantry soldier. it takes a lot of courage and a lot of determination to fight tanks like that. >> reporter: the ukrainians are supplying the courage. it's up to the u.s. and its allies to supply the weapons. david martin, cbs news, the pentagon. >> diaz: and this programming