AIR FORCE ACADEMY, Colo. (AP) — President Barack Obama implored the next generation of US military leaders Thursday not to give in to isolationism or pull back from US leadership in the world, drawing a contrast with a foreign policy vision that’s been laid out by Donald Trump.

Obama used his final commencement address as president to reassure the military that it remains the world’s dominant fighting force, implicitly pushing back against critiques that the military’s might has ebbed under his watch. Under searing sun and sweeping blue skies at the US Air Force Academy, he told graduates they’d be called upon to strike a complicated balance between realism and idealism, withdrawal and overreach.

“We can’t be isolationists. It’s not possible in this globalized, interconnected world,” Obama said. “In these uncertain times, it’s tempting sometimes to try to pull back and wash our hands from conflicts that seem intractable, let other countries fend of themselves.”

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Calling isolationism a “false comfort,” he added that history had shown how “oceans alone cannot protect us.”

Though Obama didn’t mention Trump or any other presidential candidates, his intended target was clear. Trump, the presumptive Republican nominee, has called repeatedly for putting “America first” by rethinking US alliances, spending less to ensure other countries’ security and enacting strict tariffs that Trump acknowledges could potentially lead to a trade war.

Obama’s rebuke of that philosophy came the same day the likely Democratic nominee, Hillary Clinton, was launching a concerted attack against Trump’s foreign policy with a speech in San Diego. Campaign aides said that Clinton planned to assail Trump as dangerous to US national security and unqualified to serve as commander in chief.

Though Obama has waited to start campaigning in earnest until the Democratic primary is concluded, he’s worked increasingly to undermine Trump’s appeal by attacking his policies directly and indirectly. A day earlier, Obama was in a conservative stretch of Indiana on a self-described “myth-busting” mission to derail GOP arguments on the economy.

“When we panic, we don’t make good decisions,” Obama told the Air Force Academy graduates and their families. He said that the US had to engage with the world but must also be wary of overextending itself, particularly with regard to military intervention.

“We have to chart a smarter path,” he said. “As we saw in Vietnam and the Iraq war, often times the greatest damage to American credibility comes when we overreach, when we don’t think through the consequences of all of our actions.”

"As we navigate this complex world, America cannot shirk the mantle of leadership." —@POTUS to @AF_Academy https://t.co/MLM0DqUd2R — White House Archived (@ObamaWhiteHouse) June 2, 2016

In another clear nod to Trump, Obama specifically mentioned the value of NATO, an alliance that Trump suggests is outdated.

Though Obama came into office pledging to end two wars and to keep the US out of unnecessary entanglements, he’s repeatedly bumped into the reality of overseas messes that seem to have pulled the US back in.

Nearing the end of his term, Obama is weighing whether to once again increase the number of troops he’ll leave in Afghanistan. In Iraq, troop levels have crept back up, while special forces have been dispatched to Syria and Libya. Deep concerns about Russia and China have spurred calls for a more aggressive US military posture in eastern Europe and Asia.

“We have a responsibility to always give our troops a clear mission,” Obama said, along with “a plan for what comes after” the conflict.

Although he conceded that the military’s ranks have decreased — a necessity, he said — Obama insisted the US armed forces are still “by a mile the strongest in the world.”

Of the 812 Air Force Academy graduates this year, 345 are going on to train as pilots, the Air Force said. Sixty of them will train to operate remotely piloted aircraft, such as drones, which have become a central tool of U.S. counter-terrorism efforts under Obama. About one-quarter of the class is female.

The ceremony ended with a bang, as fighter jets in tight formation streaked across the sky over the stadium as graduates tossed their caps high in the air.

For Obama, the speech was the culmination of a yearly tradition of addressing one of the military’s four service academies at graduation. This year, Obama also delivered commencement addresses at Howard University in Washington and Rutgers University in New Jersey.