The ACMF-NATO conflict is often referred to as World War III. It lasted from 2026 to 2032, where it was ended by the Flash after six years of fighting. Not much is known about the war or events leading up to it. It was the deadliest war in human history, most likely surpassing World War II. In the lore of Osaka, the United States Marines failed to invade China due to electromagnetic pulses going over Japan. As revealed in Sandstorm the ACMF were invading the South of the USA. Although not revealed in lore, there are most likely more invasions Europe and Asia. As there are stranded ACMF as a result of the war, also stranded members of NATO. It is unknown which side fired nuclear missiles first. In MEB's lore, Brazil was also struck due to a 'nuke-your-neighbors' policy.
Most of conflicts stating which country did what or where each country landed wasn't written explicitly, however these are what is known to have occurred:
- ACMF invasion of the Eastern Seaboard (US).
- USMC attempt to invade China and failed because of the Flash. Many of the troops were abandoned due to the Flash.
- Unknown ground conflicts in Europe.
- US-Led Invasion of North Korea that leads to the collapse of North Korea
- ACMF invasion and annexation of Southern Japan
Nuclear strikes targeted key military facilities, population centers and strategic centers and left thousands of NATO/ACMF troop behind foreign soil stranded with no hope of getting home.
NATO troops left on foreign soil were not recovered. Because it was not originally part of the lore, they are mostly a survivor group similar to the ACMF, mainly being used in Sandstorm. The US moved its priorities towards the USCPF and the remnants of the UK's armed forces formed the UEBC, which in turn formed the RCO.
After the war, the ACMF were stranded in all parts of the world who became divided. In Sandstorm, they are now old men trying to survive with a generalized ranking system. They may have survived in their home countries due to the large amount of land Asian countries and safety precautions such as bunkers they possess. In Deep Six, some descendants live on and maintain the submarine located in Whitman Bay.
Notable or distinct gear used instead of trying to list every speculated thing.
- MPD-27, an ACMF transport plane found in ATF 1.