WASHINGTON (AP) — 3M has fired prominent company executive Michael Vale due to “inappropriate personal conduct and violation of company policy,” the maker of Post-it notes, industrial coatings and ceramics announced on Monday. Vale was promoted to group president and chief business and country officer just last month. Vale worked at 3M for more than 30 years, according to an April 25 press release announcing his promotion, which said he would report to Chairman and CEO Mike Roman.