|Builder:||Marietta Manufacturing Company, Point Pleasant, West Virginia|
|Laid down:||as Maj.-Gen. Erasmus Weaver for the U.S. Army|
|Acquired:||by the Navy, 1944|
|Renamed:||Canonicus, 1 May 1955|
|Reclassified:||MMA-12, 7 February 1955|
|Class & type:||Camanche-class minelayer|
|Displacement:||1,320 long tons (1,341 t) full|
|Length:||188 ft 2 in (57.35 m)|
|Beam:||37 ft (11 m)|
|Draft:||12 ft 6 in (3.81 m)|
|Speed:||12.5 knots (23.2 km/h; 14.4 mph)|
|Complement:||69 officers and enlisted|
|Armament:||1 × 40 mm gun|
Canonicus was originally delivered to the United States Army Coast Artillery Corps, Mine Planter Service in 1942 by Marietta Manufacturing Company of Point Pleasant, West Virginia. The ship was named USAMP Major General Erasmus Weaver for Erasmus M. Weaver, Jr., the first chief of the National Guard Bureau.
After serving in the Mine Planter Service of the U.S. Army Coast Artillery Corps, it was transferred to the Navy in 1944, classified ACM-12. ACM-12 was reclassified MMA-12, 7 February 1955 and assigned the name Canonicus on 1 May 1955. Canonicus was never commissioned and thus never bore the "United States Ship" (USS) prefix showing status as a commissioned ship of the U.S. Navy.
- Colton, T. (December 19, 2011). "U.S. Army Mine Craft". Shipbuilding History. Retrieved 6 May 2013.
- Naval History And Heritage Command. "Canonicus iv". Dictionary of American Naval Fighting Ships. Naval History And Heritage Command. Retrieved 6 May 2015.
- Naval History And Heritage Command (January 6, 2015). "Ship Naming in the United States Navy". Heritage. Naval History And Heritage Command. Retrieved 6 May 2015.
- Grover, David (1987). U.S. Army Ships and Watercraft of World War II. Naval Institute Press. p. 130. ISBN 0-87021-766-6. LCCN 87015514.