http://hosted.ap.org/dynamic/stories/U/US_TOO_MANY_TANKS?SITE=VANOV&SECTION=HOME&TEMPLATE=DEFAULT

he first editions of the Abrams tank were fielded in the early 1980s. Over the decades, the Abrams supply chain has become embedded in communities across the country.

General Dynamics estimated in 2011 that there were more than 560 subcontractors throughout the country involved in the Abrams program and that they employed as many as 18,000 people. More than 40 of the companies are in Pennsylvania, according to Sen. Robert Casey, D-Pa., also a staunch backer of continued tank production.
A letter signed by 173 Democratic and Republican members of the House last year and sent to then-Defense Secretary Leon Panetta demonstrated the depth of bipartisan support for the Abrams program on Capitol Hill. They chided the Obama administration for neglecting the industrial base and proposing to terminate tank production in the United States for the first time since World War II.

Portman, who served as President George W. Bush’s budget director before being elected to the Senate, said allowing the line to wither and close would create a financial mess.

The context of this is why Congress keeps ordering tanks ths Army doesn’t want or need.