The B-17 Ball turret. Every military aviation fan has looked ... two major breakthroughs' The best fried chicken chain in the US is not Chick-fil-A, according to diners. See the top 10.

The widely used M109 carries a 155-mm howitzer and is the principal self-propelled artillery support for U.S. Army divisions. It is a large tracked vehicle with a fully traversable turret and ...