He entered the United States Navy the same year and served as a hospital corpsman in the Naval Reserve until 1922.

A member of the House Committee on Post Office and Civil Service, he championed federal pay raises and improvements for postal workers.

Wallhauser represented the 12th New Jersey District, which at the time included the South Ward of Newark, Irvington, Maplewood, Millburn, Livingston and municipalities in West Essex County.

Wallhauser's other activities included chairman and trustee of the Paper Mill Playhouse, Millburn, New Jersey; member and treasurer of the National Board of Directors, Family Service Association of America; president, Bureau of Family Service of the Oranges and Maplewood; vice president and trustee, St. Barnabas Medical Center, Livingston, N.J.; director of the Maplewood Bank and Trust Company, Yorkwood Savings and Loan Association and of Goodwill Industries of New Jersey; and member of the American Legion.

1, of the Grand Lodge of New York, F.& A.M. Wallhauser lived in Maplewood for 63 years until his death on August 4, 1993, in Livingston, New Jersey.