Memorandum for All Military and Department of Defense Personnel: Message to the Force -- Warfighting Readiness [open pdf - 261KB]
From the Document: "In today's complex world, there is no shortage of threats to our country's security. Given this reality, the American people rightfully expect the Department of Defense to safeguard the liberty and prosperity that define the character of this nation, above all else. To do so, we must continue to adapt to ensure we remain the most powerful warfighting force in the world. [...] In this new era of strategic competition among great powers, the Joint Force must be ready to fight large-scale combat operations in a joint, multi-national, multi-domain environment, under the most demanding conditions."
Department of Defense: https://www.defense.gov/