There are two main reasons for the spending drop. The first is the Obama administration’s decision to start removing U.S. troops from Iraq and Afghanistan. The second has to do with a process known as sequestration.
...
The most recent Obama budget proposed a 7.8 percent increase in the base Defense Department budget between 2015 and 2016. The
spending bill enacted this fall puts the defense budget on a path to start growing in fiscal year 2016, up about 6 percent from the previous year.
"It’s still not quite as much as the president requested, but it’s much closer," said Todd Harrison, director of defense budget analysis at the Center for Strategic and International Studies.