By Drew Griffin and Kathleen Johnston
HERLONG, California (CNN) - If you need an example of why it is hard to cut the budget in Washington look no further than this Army depot in the shadow of the Sierra Nevada range.
CNN was allowed rare access to what amounts to a parking lot for more than 2,000 M-1 Abrams tanks. Here, about an hour's drive north of Reno, Nevada, the tanks have been collecting dust in the hot California desert because of a tiff between the Army and Congress.
The U.S. has more than enough combat tanks in the field to meet the nation's defense needs - so there's no sense in making repairs to these now, the Army's chief of staff Gen. Raymond T. Odierno told Congress earlier this year.
If the Pentagon holds off repairing, refurbishing or making new tanks for three years until new technologies are developed, the Army says it can save taxpayers as much as $3 billion.
2012 has been a busy year at Security Clearance. From the U.S. diplomatic facility attack in Benghazi, Libya to the Petraeus sex scandal to the future of Afghanistan and the Pentagon preparing(or not) to fall off the fiscal cliff.
But there have been numerous other stories that have caught your eye this year.
Top 10 Security Clearance stories you, the readers, made the most popular in 2012:
10. Navy detects Russian sub off U.S. East Coast
The U.S. Navy detected and tracked a Russian nuclear-powered attack submarine less than 300 miles from the southern U.S. East Coast last November, U.S. Defense officials said.
While the submarine did not enter U.S. territorial waters or follow any U.S. Navy ships, its arrival came while a Navy carrier strike group was training off Florida, according to the defense officials.