The federal definition of MI for PASRR is best understood in terms of the four âDâsâ: 1  A diagnosis or suspicion of a major mental illness such as schizophrenia, bipolar disorder, major depression, or an anxiety disorder such as OCD. 2  An absence of dementia. 3  A well-defined duration.  A particular level of disability.
Well-known World War II tanks were the German Panzer IV, Panther and Tigers, Soviet T-34 (produced in the largest numbers of any tank of the war and second most ever), British Matilda, Churchill and Cromwell, and American M4 Sherman (second most produced tank of the war) and Stuart tanks.
The M48 Patton medium tank was the most common United States tank to be used during the Vietnam War. It was involved in the only tank vs. tank battle between the US Army and the North Vietnamese Army during the Vietnam War, the Battle of Ben Het in 1969, when several M48 Patton medium tanks fought 10 North Vietnamese PT-76 light amphibious tanks.