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This memorial consists of ammunition replicas, presented to the Army Officers' Mess by all ranks of the Air Defence Artillery School (and is located on the 2nd floor of the Mess in Ottawa). This rack of 40mm Bofors ammunition replicas was presented on behalf of all Canadian Air Defence Gunners.

This memorial is a 1 Surface-to-Surface Missile Battery Royal Canadian Artillery Crest, presented on July 1, 1970, on disbandment of 1SSM Battery RCA. It was presented to the Artillery Officers in the CFHQ, and is dedicated to the honour of the Officers and Men of the Royal Regiment of Canadian Artillery. It is located on the 2nd floor of the Army Officer's Mess in Ottawa.

Note: CFHQ (Canadian Forces Headquarters) has changed to the National Defence Headquarters, and the Honest John missile system that 1 SSM Battery was equipped with has ceased to be a part of the inventory.

This memorial displays the unit crests of the Royal Canadian Artillery. At the base of the bar, there is a series of five carved crests to represent the Royal Canadian Horse Artillery. They include: First Regiment Royal Canadian Horse Artillery, Second Regiment Royal Canadian Horse Artillery, Third Regiment Royal Canadian Horse Artillery, Fourth Regiment Royal Canadian Horse Artillery, and 5^e Regiment Royal Canadian Horse Artillery.

The crests originate from the pews in the Deilinghofen church in Germany, and it appears there was not a sufficient quantity of crests to complete the bar. The original crests were complemented with the addition of these: Air Defence, Air OP, and 30th Field Artillery Regiment, RCA.

This memorial is dedicated to the honour of the Officers and Men of the Royal regiment of Canadian Artillery, and is located on the 2nd floor of the Army Officer's Mess in Ottawa.

This memorial is a stained glass window with an inset of the badge of The Royal Regiment of Canadian Artillery. The RCA badge window was presented to Observation Post de Hart (Op de Hart, home of the Ottawa Gunners) by all ranks of the 3rd Field Regiment RCA, The Loyal Company, on January 27, 1995. It is dedicated to the Officers and Men of the Royal Regiment of Canadian Artillery who served with NATO. It is located on the 2nd floor of the Army Officer's Mess in Ottawa.

The Standing orders of the Royal Regiment of Canadian Artillery provides the following description:

"A smooth- bore 9-pounder field gun Or (gold) on a field Vert (green) above a scroll Azure bordered Or inscribed "UBIQUE" Or below the gun a scroll Azure bordered Or inscribed "QUO FAS ET GLORIA DUCUNT" the whole surmounted by the Royal Crown proper." The RCA badge is used both as cap badge and as a crest. The RCA Badge was approved by the Chief Herald of Canada in August 2006.

The Colours of the Bytown Gunners was presented to the Ottawa gunners Association, celebrating the 150th anniversary of the 2nd Ottawa Field Battery, Royal Canadian Artillery 1855-2005. The memorial is located in Observation Post de Hart (Op de Hart, home of the Ottawa Gunners), on the 2nd floor of the Army Officer's Mess in Ottawa.

The Colours of the Bytown Gunners provides a representation of each of the guns that the unit has been equipped with throughout its history, from the 6 Pounder 58ML gun during the days of the Volunteer Militia Field Battery of Ottawa, to the 105mm C3 howitzer of the present day unit. This memorial celebrates the 150th anniversary of the 2nd Ottawa Field Battery, Royal Canadian Artillery 1855-2005.

This pennant was presented to Brigadier-General R.A. Dallaire, OMM, CD during his tenure as the Director of Artillery from July 1988 until July 1989. On completion of his tour of duty, he asked that this pennant be displayed in the Ottawa Army Officer's Mess, Observation Post de Hart (Op de Hart). It is dedicated to members of the artillery unit.

In October 1988, the full achievement of the Artillery badge superimposed on a standard 7x11 inch, red-over-blue triangular pennant was accepted as the Director of Artillery's official pennant. This pennant is flown by the Director of Artillery during official visits to Artillery formations.

The RCHA Cipher Window was presented to Observation Post de Hart (Op de Hart, home of the Ottawa Gunners) on May 26, 1995 by Colonel and Mrs. W.R. Dawes. The stained glass window with an inset of the cipher of the Royal Canadian Horse Artillery is on the 2nd floor of the Army Officers' Mess in Ottawa. It is in honour of the Officers and Men of the Royal Regiment of Canadian Artillery who served with NATO.

The cipher is proudly displayed by our Regular Force Field Artillery units, the 1st Regiment Royal Canadian Horse Artillery, the 2nd Regiment Royal Canadian Horse Artillery, and the 5e Régiment d'artillerie légère du Canada. To quote from the Standing Orders of the RCA:

"This badge is only used by RCHA units and associations as a crest. The RCHA Badge is based on the badge of the Order of the Garter which dates from 1348. The motto of the Order of the Garter, "Honi soit qui mal y pense" ("Shame on him who thinks this evil"), is not considered as a motto of the artillery."

Presented in 1992 to Observation Post de Hart (Op de Hart, home of the Ottawa Gunners) by Lt.Col. (Ret'd) J.J. Donahue, President of the Ottawa Gunners. The memorial is a statue of Saint Barbara, the patron saint of gunners, artillery and explosives, personnel, and military engineers.

One of the Military Attaches' in Ottawa decided that the figure needed a better home than the one that he could provide. Lieutenant-Colonel Jerry Donahue was quick enough to seize the opportunity and the statue of Saint Barbara came to reside in Observation Post de Hart (Op de Hart) on the 2nd floor of the Army Officers' Mess in Ottawa.

The War of 1812 Monument, Triumph Through Diversity sits on Parliament Hill, at the South East corner of East Block, facing the National War Memorial. It is dedicated to the people who defended Canada during the War of 1812 and was unveiled on November 6, 2014.

It was designed by Adrienne Alison to commemorate the 200th anniversary of the War 1812. The two smooth granite boat-shaped pieces symbolize the ships used by the Royal Navy and remind us that part of the war was fought on water. Atop the rough granite center base that recalls the Canadian landscape, seven bronze figures form a circle illustrating the stages of battle. Each is approximately seven feet tall and represent the key combatants that came together to defeat the American invasion: a Métis fighter firing a cannon; a woman bandaging the wrist of a Voltigeur; a Royal Navy sailor pulling a rope; a Mohawk warrior pointing out the advancing enemy; a Canadian militiaman raising his arm in triumph, and a member of a British Army unit, specifically the Royal Newfoundland Regiment, firing a musket.

Alison consulted experts to ensure the accuracy of the clothing and sourced authentic weaponry for the statues. She enlisted live models to pose for about 40 hours each, including a Six Nations Mohawk man who travelled to Toronto several times from Brantford, Ontario.

A maple tree was planted in soil that was taken from ten Canadian battlefield sites. It was watered at the dedication with water from six oceans and lakes that were significant in the War of 1812. The tree symbolizes the Canadian nation that grew out of the unifying effort to defend Canada against the American invasion during the War of 1812 and pays tribute to the many naval battles that played a part throughout the war. 

This memorial consists of a framed scroll, and is dedicated to the members of All Saints' Anglican Church who served in the Second World War. It was unveiled by All Saints' Anglican Church.

The scroll has names arranged in four columns, and although not specified on the scroll, it appears members who gave their lives have their names written in red.

All Saints' Anglican Church Westboro shares a building with First United Church.