UnScramble this Word: m c s u i?

Questions

On This Day In January 1967 - U.S. and South ______ forces launched a major offensive, known as Operation "Deckhouse V", in the Mekong River delta.?

On This Day In January 1974 - ______ radio debuted "Radio Mystery Theatre.?

On This Day In January 1975 - The ______ premiere of "The Wiz" opened.?

On This Day In January 1975 - ABC-TV debuted "A.M.______ .?

On This Day In January 1982 - William G. ______ was convicted in Los Angeles, CA, of being the "freeway killer" who had murdered 14 young men and boys.?