Is America's military big enough?

Past administrations have increased military spending, but typically to fulfill a specific mission. Jimmy Carter expanded operations in the Persian Gulf. Ronald Reagan pursued an arms race with the Soviet Union, and George W. Bush waged wars in Iraq and Afghanistan.

Mr. Trump has not articulated a new mission that would require a military spending increase. This has left analysts wondering what goals he has in mind. Erin M. Simpson, a national security consultant, called Mr. Trump’s plans “a budget in search of a strategy.”