 Both Germany and the United States have developed several other rounds . These include the German DM12 multi @-@ purpose anti @-@ tank projectile ( MPAT ) , based on the technology in a high explosive anti @-@ tank ( HEAT ) warhead . However , it has been found that the DM12 's armor @-@ killing abilities are limited by the lack of blast and fragmentation effects , and that the round is less valuable against lightly armored targets . The United States also has a MPAT type projectile , known as the M830 . This was later developed into the M830A1 , which allows the M1 Abrams to use the round against helicopters . The M1 Abrams can use the M1028 canister round , which is an anti @-@ personnel / anti @-@ helicopter munition , packed with over 1 @,@ 000 tungsten balls . The United States Armed Forces accepted a new demolition round , called the M908 Obstacle Defeating Round , based on the M830A1 MPAT , but with the proximity fuse replaced by a hardened nose cap . The cap allows the round to impact and embed itself in concrete , then exploding inside the target and causing more damage . 
