1922 – Four fires occurred:  March 23rd-two grass fires and another April 22nd. Sept. 9th-a cottage roof sustained damage from sparks from a chimney.  The City sent to the island five 2½-gallon extinguishers, fire hooks, axes and tools for fire protection.

1923 – The N.B.F.U. report conducted during August and September mentions “A small amount of minor Equipment and extinguishers are provided on Diamond Island and assistance is rendered by the garrison from Fort McKinley, which has a 500gpm motor pumper” (pages 8 and 9)

1927 – A hand-drawn hose wagon formally used on the mainland, with 650 feet of hose, was assigned to the Island and a man employed to care for fire apparatus. Also, fire hydrants were installed.

1938 – N.B.F.U. report conducted during June and July mentions “A small amount of minor apparatus & equipment is provided on Great Diamond Is. and a resident is paid to drive and care for the equipment and to respond to fires.  Fort McKinley men respond to fires with a 500gpm pumper.”

1947 – The U.S. Army began closing the Fort, and fire protection was needed for the island residents.

1949 – Great Diamond Island Volunteer Fire Company organized.  The N.B.F.U. report during July and September mentions “A hose wagon with booster pump is located on Great Diamond Island.”

1961 – Fort McKinley property was sold to private parties.

1964 – New two-wheel trailer carrying hose and other equipment, was assigned as Trailer #5.

1971 – A spare 1942 Chevrolet1 & ½-ton tank truck (#2) was reconditioned for the island.  It was replaced in 1976 with a 1941 Dodge 1 & ½-ton tank truck (#1) from Long Island.

1983 - 1968 Ward LaFrance 1,000gpm pumper (old E-5, 11, reserve E-10) was assigned to the Island.

1988 - Tank 6, 1965 Ford/Young Equipment Co. 500-Gallon tank truck w/500gpm pump                                                                       (Formerly Tank Tr. 6 and Long Island tank truck, was assigned only for the summer).

1989 – A 1963 American LaFrance 1,000gpm pumper was purchased from Industry, Maine to improve fire protection.  A wood-frame storage shed was remodeled into a two-bay firehouse, with quarters for firefighters behind the apparatus, and a security office and meeting room, Work was completed in 1990.

1990 – Four Portland firefighters were assigned to Great Diamond for the summer months, working 24-hour shifts, one on each of the on 4 platoons.  A 1986 Ford ambulance was also assigned on the island. The detail was not funded again after 1990.

1992 – A former 1969 GMC Oil truck was acquired as a 2,400-gallon tank truck with a 250gpm pump and designated as Tank 13 (Island now with two fire trucks).

1994 – Four 4x 6 foot hose carts were delivered to the island, and two more on December 4th.

1996 - Ambulance, 1986 Ford E-350 ambulance (ownership to City of Portland, DPW #914).

June 3, 1997 – A Mack 1,000gpm pumper (old E-1) was sent to Great Diamond as Engine 13, replacing the American LaFrance pumper, which sent to Cushing Island.

October 18, 2001 – New hose trailer delivered.