“It was at the end of a major conflict, the end of the Cold War. It also occurred at the end of Operation Desert Storm, in the middle of a budget downturn and at a time when the Defense Department needed to come to grips with a new array of threats,” he says.

“Guess what: That’s exactly where we are today. The end of a major conflict, certainly in a Defense Department downturn, and with an array of threats that, frankly, are making the world more dangerous than even at the end of the Cold War,” Gunzinger says.

His report points to proportions of the budget that have not changed dramatically since fiscal year 1992. Since then, the Navy and Marine Corps still have maintained the largest share of the overall defense budget with roughly 30 percent, followed by the Air Force at about 28 percent and Army with 25 percent.

“Forces today – with the exception of special operations – really look like the force that we had that came out of the 1993 bottom-up review,” Gunzinger says.

The military is poised to reevaluate its overarching plans in the 2014 Quadrennial Defense Review – the congressionally mandated report the Pentagon puts together every four years on the state of threats and how it will address them.

The military must move beyond preparing its entire force to address one or two particular kinds of threats, as it did in 1993, says Gunzinger.

For example, the Air Force prepares itself to defeat invading enemy forces and support the resulting response at two separate borders, such as on the Korean peninsula or in the Middle East.

“Those two conventional cross-border invasions did provide a fairly decent model for planning in the past, but that’s not necessarily the kinds of conflicts we need to prepare for in the future,” says Gunzinger, pointing specifically to the White House’s new “rebalance to the Pacific.”

The Air Force’s use of drones, particularly the MQ-1 Predator and MQ-9 Reaper, have been “fantastic” in wars in the Middle East over the last 12 years. But those won’t work well in the Pacific. It should instead focus on long-range, low observable unmanned aircraft, Gunzinger says.

The Navy should look at more undersea warfare capabilities and long-range threats. The Army should spend less time focusing on repelling tanks and more time on missile defense and training indigenous forces. The Marine Corps should shy away from acting as America’s second land army and more for deterrence and crisis response.

“Rather than asking all services to prepare for the exact same thing, that could drive a lot of redundancy into the force, why not better focus them?” Gunzinger says. “You always have to consider the budget, but … we really need to ensure that we’re making the right investments to develop the future force that’s better capable of handling the kinds of threats we’ve discussed.”

And simply building a force that can meet reduced budgets will leave the U.S. vulnerable in the future.

“If that’s what the QDR is all about, just another drill to balance the books, what we may end up with is a smaller version of today’s force that’s best prepared for fading threats,” he says. “And that would be a lost opportunity.”