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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Defense secretary under Nixon:

LAIRD: Nixon defense secretary
LAIRD: Defense secretary under Nixon
LAIRD: Nixon's defense secretary
LAIRD: Nixon's Defense Secretary Melvin
LAIRD: Nixon's Secretary of Defense
LAIRD: Nixon's first Defense secretary
LAIRD: Nixon's first Secretary of Defense