President Barack Obama sought to lay the groundwork Friday for his last year in office by vowing not to fade in the background but instead use his remaining months to push longstanding goals to fruition.

"In 2016, I'm going to leave it all out on the field," he said. "Wherever there's an opportunity, I'm going to take it."

In his annual year-end news conference, Obama portrayed 2015 as one of significant progress for his agenda, pointing to diplomacy with Iran and Cuba, Asia-Pacific trade agreement and an unprecedented global climate treaty as big wins for his administration. He also praised a Supreme Court ruling legalizing gay marriage..

Still, he said, he plans to do much more in 2016.

"I said at the beginning of this year that interesting stuff happens in the fourth quarter '€” and we are only halfway through," Obama said.

The end of 2015 marks a major transition point for the president, who has one year left to try to finish as many of his projects as possible. He won't be rolling out sweeping new policy proposals that would be unlikely to get serious consideration amid the focus on electing his successor. The White House is promising Obama will deliver a "non-traditional" State of the Union address in January laying out an agenda that includes further executive steps on climate change and gun control.

Amid widespread fears about terrorism and extremists, Obama pushed back against critics questioning his strategy for overcoming the Islamic State group in Iraq and Syria. "There's only so much bombing you can do," he said, though he insisted anew, "We will defeat ISIS."

He also affirmed his longstanding position that Syrian President Bashar Assad must leave power for Syria to resolve its civil war, even though his administration has recently said it could accept an unspecified transition period during which Assad stayed.

Still, Obama contended about Syria, "Five years later, I was right."

Calling attention to his signature legislative achievement, Obama announced that 6 million people had signed up for health care so far this year under the Affordable Care Act, a surge that officials say illustrates the program's durability.

After the news conference, Obama was to depart for San Bernardino, California, where he planned to meet with families of the 14 victims of the recent mass shooting. He then will fly to Hawaii where he'll spend two weeks on vacation with his wife and daughters in what has become a family Christmas tradition before returning to the White House in January.

Hours before his departure, Congress passed a major bipartisan budget package that staved off a potential government shutdown and extended tax cuts for both families and businesses. The White House has indicated Obama will sign it.

Obama said lawmakers had ended the year on a "high note" with additional legislation on transportation and education. He noted optimistically that by averting a funding crisis for the next nine months, Congress had cleared a path for cooperation with him next year on areas of common ground.

"Congress and I have a long runway to get some things done for the American people," he said. He pointed to a potential criminal justice overhaul and congressional consideration of the Trans-Pacific Partnership trade pact as areas ripe for cooperation.

Obama said he'd present a long-delayed plan to close the detention centers at Guantanamo Bay, Cuba, to Congress early next year, then wait for lawmakers' reaction before determining whether to take action on his own to shut it. He predicted the prison population would dwindle by early next year to less than 100, a threshold his administration has been pushing for to bolster its argument that keeping the facility open isn't cost effective. (kes)

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Associated Press writer Josh Lederman contributed.

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