"Ich bin Viking" is correct. Using the indefinite article "ein" is not correct. A famous example is President Kennedy's blunder when he said "Ich bin ein Berliner", meaning to say that he was a citizen of Berlin. He should have said, "Ich bin Berline...
I've owned any number of backpacks in my lifetime but none MOLLE by name nor shall I presently. Thank you for organizing your sources because that helps me assist you. God decides. You only produce an American one cent coin. Toss coin into air above ...
John F. Kennedy said "Ich bin ein Berliner" to a German crowd in Berlin. The statment translated to English as "I am a jelly donut." What he was trying to say is "Ich bin Berliner."