<p>Shortly before dawn on Aug. 28, an M1A1 Abrams tank on routine patrol in Baghdad “was hit by something” that crippled the 69-ton behemoth. Army officials still are puzzling over what that “something” was.</p>
<p>According to an unclassified Army report, the mystery projectile punched through the vehicle’s skirt and drilled a pencil-sized hole through the hull. The hole was so small that “my little finger will not go into it,” the report’s author noted.</p>