The Pentagon's top technology development official has designated a one-star admiral to head the Missile Defense Agency until the nomination for a new director to fill the three-star billet -- one of many senior officer promotions being blocked by Sen. Tommy Tuberville (R-AL) -- is confirmed by the Senate. On July 27, Rear Adm. Douglas Williams -- promoted from captain in June -- was designated by Under Secretary of Defense for Research and Engineering Heidi Shyu to head MDA while...