Pentagon officials released an 11-page unclassified version of the strategy on Friday, saying it mapped out a "fundamental shift" in focus for the military.
Defense Secretary Jim Mattis warned Friday that a government shutdown would negatively impact the operations of the United States military.
The United States will develop coalitions in Afghanistan, Iraq, Syria and other countries to build on the progress made against terrorist organizations as well as to counterbalance Iran's influence over the region, the New Defense Strategy said.
The new NDS emphasizes three lines of effort to restore a competitive military advantage: building a more lethal force, strengthening traditional alliances and build new partnerships, and reform the Defense Department's business practices "for performance and affordability".
At the Pentagon briefing, Colby declined to specify exactly how the US military's advantage is eroding, saying only that both China and Russian Federation are moving ahead "across all domains", including maritime and aerospace.
In a statement that would not have seemed out of place on the battlefield, Mattis said, "If current structures inhibit our pursuit of lethality, I expect service secretaries and agency heads to consolidate. eliminate, or restructure to achieve the mission".
Defense Secretary James Mattis said Friday that a government shutdown would have a "terrible impact" on the military, which he said deserved the full support of the nation.
"Rogue regimes like North Korea and Iran persist in taking outlaw actions that threaten regional and even global stability", Mattis said.
"The nation must feel sufficient capable forces to fight conflicts", Mattis said, speaking on the lethality of US forces.
The Department of Defense will also work to "reduce management overhead and the size of headquarters staff", reduce or eliminate duplicate systems for handling things like healthcare, travel or finance, and sell off property and infrastructure it no longer requires. The strategy was formed after years of frustration from senior military leaders that the Pentagon's fleet of aircraft, vehicles and ships have been worn down in seemingly endless warfare.
The retired four-star general also warned that the US military's competitive edge "has eroded in every domain of warfare - air, land, sea, space and cyberspace - and it is continuing to erode". "We must shed outdated management and acquisition practices while adopting American industry's best practices".
While making clear that USA troops would continue to perform their duties at home and deployed overseas, Mattis said that over 50% of the civilian workforce would not come to work and that maintenance operations and the training of reservist troops would be affected. Mattis envisions a force that would be flexible and capable of acting and reacting swiftly and decisively.
But it also stresses a need for burden-sharing - a nod to Trump's haranguing of allies who, he says, let Washington pick up the military bills. "We need Congress back in the driver's seat of budget decisions, not in the spectator seat of Budget Control Acts' indiscriminate and automatic cuts".
"To address the scope and pace of our competitors" and adversaries' ambitions and capabilities, we must invest in modernisation capabilities through sustained, predictable budgets, ' it added. "In my past, I fought many times and never did I fight in a exclusively American formation", Mattis said. But Defense Secretary Mattis said "no enemy in the field has done more to harm the readiness of the US military" than the inability of Congress to agree on a budget.