Updated

WASHINGTON -- President Obama recognized a former U.S. president, a basketball legend and a civil rights hero Tuesday among the 15 recipients of the Medal of Freedom. They included German Chancellor Angela Merkel.

During a ceremony at the White House, Obama said the recipients represent, "the best of who we are and who we aspire to be."

The Medal of Freedom is the nation's highest civilian honor, and is presented to people who have made important contributions to U.S. national security, world peace, culture or other significant public or private endeavors.

Among the recipients honored Tuesday were former President George H.W. Bush, former basketball star Bill Russell, businessman Warren Buffett and civil rights activist Rep. John Lewis, a Democrat.

Obama praised Bush, who was president in the late 1980s and early 1990s, for his more than 70 years of service to his country, saying his life is a testament to the belief that public service is a noble calling.

"His humility and his decency reflects the very best of the American spirit," Obama said.

Merkel was not present for the ceremony. Obama said he would present her the award when she visits the U.S. No date was available.