A bipartisan group of budget experts called Wednesday for steep cuts in future military spending, just as leaders of a presidential debt-reduction commission proposed last week.

Taken together, the reports are likely to intensify pressure to reduce Pentagon spending and cancel troubled weapons programs as part of a broad effort to reduce federal budget deficits.

But the proposals, which would cut back on expensive planes like the F-35 fighter and the V-22 Osprey, represent only the start of what could be a long debate. And it is already clear that many of the suggestions will be hotly disputed in Congress.

The plan released Wednesday included a five-year freeze on Pentagon spending, along with sweeping changes in taxes and other federal programs, to reduce projected deficits by $5.9 trillion through 2020. It was prepared by a group led by former Senator Pete V. Domenici of New Mexico, who was the senior Republican on the Senate Budget Committee for more than a quarter-century, and Alice M. Rivlin, who served both Congress and then-President Bill Clinton as a budget director.