I think active duty numbers can be misleading, since I believe many countries rely on military reserve forces, especially ones with smaller populations, e.g.:
https://en.wikipedia.org/wiki/Finnish_Defence_Forces#Militar...:
> At the completion of the service, the conscripts receive a reserve military rank of private, lance corporal, corporal, sergeant or second lieutenant, depending on their training and accomplishments.[24] After their military service, the conscripts are placed in reserve until the end of their 50th or 60th living year, depending on their military rank. During their time in reserve, the reservists are liable to participate in military refresher exercises for a total of 40, 75 or 100 days, depending on their military rank. In addition, all reservists are liable for activation in a situation where the military threat against Finland has seriously increased, in full or partial mobilization or in a large-scale disaster or a virulent epidemic. The males who do not belong to the reserve may only be activated in case of full mobilization, and those rank-and-file personnel who have fulfilled 50 years of age only with a specific parliamentary decision.[25]
By this measure, the US is 51st on the list with a value of 4.2, behind many European countries and NATO members, e.g. Greece is #7 with 13.3.
[0] https://en.wikipedia.org/wiki/List_of_countries_by_number_of...
Sweden has 24,000 on active duty. Finland has about 21,000. Large for the size of the countries. Both have a draft. Switzerland has 120,000 troops on active duty, a draft, and a large, regularly exercised reserve, for a country with only 8 million people. All are outside NATO and prepared for self-defense.
Of the big powers, the US has 1.3 million. Russia has about 1.4 million, and China has about 2 million.