5 NATO Members with the Largest Militaries

4. United Kingdom

Active Military Personnel: 184,860

Aircraft: 466

Tanks: 213

Submarines: 10

Strategic Warships: 17

Score: 4.26

Next up on our list of NATO members with the largest militaries is the United Kingdom, which has the fifth largest military in the alliance in terms of manpower. About 750,000 people reach military age annually in the United Kingdom. Prime Minister Rishi Sunak last year pledged to increase military spending by an additional $6 billion over the next two years to counter threats faced from Russia and China.