WASHINGTON — A Syrian refugee, a former illegal immigrant who went on to serve in the U.S. Army and the lead plaintiff in the Supreme Court case last year legalizing same-sex marriage will be among the official guests Tuesday as President Barack Obama delivers his final State of the Union address.

The three men — Refaai Hamo, Oscar Vazquez and Jim Obergefell — will be joined by almost 20 other members of the armed services and civilians associated with the issues and initiatives that have defined Obama's presidency, and that he hopes will become his legacy.

The White House announced Obama's full guest list Sunday, for an address to a joint session of Congress with a speech that officials said would focus more on the issues and challenges that are shaping the future of the country than specific policy proposals.

The guests are intended to illustrate "who we are as Americans: inclusive and compassionate, innovative and courageous," according to the White House announcement. The invitees — some high profile, most conspicuously not — will sit in the House gallery with Michelle Obama, the first lady.

Hamo, a scientist who fled Syria amid civil war, settled with four of his children in Troy, Mich., on Dec. 18. After the Humans of New York, a photo blog, featured his story, readers donated more than $450,000 to support the family, and Obama publicly welcomed him to the country.