Less than 1 percent according to FiveThirtyEight.com What Percentage Of Americans Have Served In The Military? 1.4 million people about 7% of adults serves 7 percent nationwide What percentage of Americans have served in the military served their country in uniform less than one percent 7.3% of all living Americans having served in the military actually 0.4%) no one has ever served in the US military men and women of the armed forces about 7% of adults served their country in uniform according to FiveThirtyEight.com served their country in uniform One recent estimate