the Act to Congress on July 22, 2011. Implementation of repeal was completed 60 days later, so that DADT was no longer policy as of September 20, 2011. Views on use of military force In a speech at Kansas State University, Mullen outlined his views about the best application of military force in present times. He characterized most wars, such as World War II, as wars of attrition, where the reduction or elimination of enemy forces signaled victory. He characterized the Cold War as an issue of containment. In characterizing the current wars in Iraq and Afghanistan, he described them as "a fight against a syndicate of Islamic extremists led by al-Qaeda and supported by a host of both state and non-state actors", citing the border between Afghanistan and Pakistan as their "epicenter". Mullen outlined three principles about the "proper use of modern military forces": Military power should not be the last resort of the state: Mullen pointed to the readiness and capacity of military forces to respond to crises as reason to deploy them sooner, rather than later, in response. "We can, merely by our presence, help alter certain behavior." Force should be applied in a precise and principled way: Mullen cites the sacrifice involved in deployment as requiring extreme care. Secondly, Mullen argues that "the battlefield isn't necessarily a field anymore. It's in the minds of the people." He cites General Stanley McChrystal's restriction of night raids I as an example of this principle in action. Policy and strategy should constantly engage with one another: Given that current engagements are open-ended, Mullen posits that military strategy must be more constantly engaged with policy. "...war has never been a set-piece affair. The enemy adapts to your strategy and you adapt to his." He cites the review process which led to the current Afghanistan escalation as a model of engagement between military leaders and policy makers. During the aftermath of the murder of George Floyd, President Trump threatened to order federal troops to quell protests; in opposition, Mullen authored an article published in The Atlantic. Mullen stated, “I am deeply worried that as they execute their orders, the members of our military will be co-opted for political purposes.” Retirement President Obama nominated General Martin Dempsey as the next Chairman of the Joint Chiefs of Staff on Memorial Day 2011. Dempsey had only been sworn in as army chief of staff