The War Museum Cambodia has a unique collection of weaponry, mostly located outside below a mango tree plantation. The collection was gathered since 1999 from areas where fighting took place; like Anlong Veng, Siem Reap and Odor Meanchey. It is a mix of Chinese, U.S. and Soviet hardware, but mostly Russian tanks and assault weapons. Some of these weapons have even seen action during World War II.

The museums collection was partly equipment which was sold for scrap metal prices. For a scrap-metal tank $300 to $400 would be paid. Competition from scrap dealers was not the only problem the museum faced as it gathered its collection: most of the machinery was very heavy and it was difficult to gain access to dense jungle areas to remove tanks, guns and personnel carriers.

Over the years the collection was supplemented by Western private individuals like military collector Geoffrey Oldham, furthermore some artifacts were given to the museum by the General Manager (Mr R.S. Esselaar) who found some of these artifacts during visits to several remote villages.

To preserve the unique collection for posterity Project Preservation was launched in 2015. Certain artifacts were brought back in the original state, other artifacts were restored.

There is a vast array of vehicles, artillery and other equipment on display. You can see Russian tanks (T-54 and T-55), a MiG-19 jet fighter aircraft, a large Mil Mi-8 helicopter, a 85-mm field artillery gun and a D-44 divisional gun. Many of the vehicles have battle damage. There are also many assault rifles, like the ubiquitous AK-47, landmines, claymore anti personnel mines, etc. There is a broad range of uniforms, flags as well as rare photographs from the war period on display.