According to Global FirePower(GFP) Database here are the list of top 10 most powerful Military in the world in 2016. The top Countries are Ranked by Power of Military Strength.
1) United States of America ( North America; NATO)
Total Population of USA :- 321,368,864
Reaching Military Age Annually :-4,220,000
Active Frontline Personnel: 1,400,000
Active Reserve Personnel:- 1,100,000
Total Tanks :- 8,848
Total Aircraft :- 13,444
Naval Strength :- 415
Total Population of Russia :- 142,423,773
Reaching Military Age Annually :- 1,355,000
Active Frontline Personnel:- 766,055
Active Reserve Personnel :- 2,485,000
Total Tanks :-15,398
Total Aircraft :- 3,547
Naval Strength :- 352
Total Population :- 1,367,485,388
Reaching Military Age Annually:- 19,550,000
Active Frontline Personnel:- 2,335,000
Active Reserve Personnel :- 2,300,000
Total Tanks:- 9,150
Total Aircraft :- 2,942
Naval Strength:- 714
Total Population of India:- 1,251,695,584
Reaching Military Age Annually :- 22,900,000
Active Frontline Personnel:- 1,325,000
Active Reserve Personnel :- 2,143,000
Total Tanks:- 6,464
Total Aircraft:- 2,086
Naval Strength :- 295
Total Population :- 66,553,766
Reaching Military Age Annually:- 775,000
Active Frontline Personnel :- 205,000
Active Reserve Personnel:- 195,770
Total Tanks:- 423
Total Aircraft:- 1,282
Naval Strength:- 118
6) United Kingdom (Europe; NATO; Eunion)
Total Population:- 64,088,222
Reaching Military Age Annually:- 750,000
Active Frontline Personnel :- 150,000
Active Reserve Personnel:- 182,000
Total Tanks:- 407
Total Aircraft:- 879
Naval Strength:- 76
Total Population:- 126,919,659
Reaching Military Age Annually:-1,215,000
Active Frontline Personnel:- 250,000
Active Reserve Personnel:- 57,900
Total Tanks:- 678
Total Aircraft:- 1,590
Naval Strength:- 131
Total Population:- 79,414,269
Reaching Military Age Annually:-1,375,000
Active Frontline Personnel:- 410,500
Active Reserve Personnel:- 185,630
Total Tanks:- 3,778
Total Aircraft:- 1,007
Naval Strength:- 194
Total Population:- 80,854,408
Reaching Military Age Annually:- 791,000
Active Frontline Personnel:- 180,000
Active Reserve Personnel:- 145,000
Total Tanks:- 408
Total Aircraft:- 676
Naval Strength:- 81
Total Population:- 61,855,120
Reaching Military Age Annually:- 570,000
Active Frontline Personnel:- 320,000
Active Reserve Personnel:- 42,000
Total Tanks:- 586
Total Aircraft:- 785
Naval Strength:- 143