Western Europe, is home to many people over the millennia, who form the fabric of the nations of Spain, France, and the United Kingdom. These people although mostly short in stature, have some hidden biological advantages for self defense to other countries.
Small populations of Western Europe, such as the Gaelic, Gaul, Celtic, and Basque tribes, have the ability to fight an occupying army through modern blood transfusion technologies. Gaelic Scotland, Gaulish, Brittany, as well as the Basque people of Bordeaux have large populations of universal donors. Universal donors means that this allows the UK, France, and Spain domestic population, capabilities of hiring armies of populations throughout the world as mercenaries, and have a universal combat blood donation, to help people from dying from bullet wounds, and shrapnel, giving a genetic advantage in warfare through universal blood type donor banks.
Blood transfusion technology was fully discovered during WWII. This blood type antigen system, allows the local population to donate blood and support soldiers on the front, or in resistance asymmetrical forces. The French Resistance army is a similar type of asymmetrical warfare. The French Resistance Army, escaped to the UK and began fighting with the UK regulars, while some stayed in Southern France, and through asymmetrical warfare, were able to win a long hard 6 year victory.
Blood transfusion technology from Western European donor O- populations, allows critical battlefield medical aid and life saving technology, which can amplify resistance capabilities of invaders. This ancient blood type is a genetic advantage in strategic warfare, allowing the French, UK, Spain, and the USA to have multi-ethnic armies which can fight foreign invaders.
If the USA begins to fight a war with the Iranian revolutionary Guard 2025-2030, the Western Europeans it will be necessary for blood donations, to prevent coalition soldiers from dying.