U.S. sending 175 Marines to Romania as part of Africa crisis team

(The story has been refiled after Pentagon says 800 Marines in Moron, Spain, not 500, in paragraph 14)

WASHINGTON (Reuters) - The Pentagon said on Wednesday it was bolstering the size of its Europe-based Africa crisis response force to 975 Marines, sending 175 new troops to a Romanian base near the Black Sea at a time of tensions over Russia's annexation of part of Ukraine.