Operation United Assistance Tax Exclusion Act of 2014 - Provides for a tax exclusion of compensation paid to a member of the Armed Forces serving in Operation United Assistance in the Ebola virus disease outbreak area (i.e. Liberia, Sierra Leone, Guinea, and any other region designated as experiencing a widespread Ebola virus disease outbreak). Requires that such service member undergo a program of not less than 21 days of controlled monitoring upon return from the outbreak area.