Top 5 Armies in the World.

5. United Kingdom

Soldiers from 32 Regiment Royal Artillery. (Ben Birchall/PA Archive)

• Power Index: 0.5185
• Active Frontline Personnel: 224,500
• Total Aircraft: 1,412
• Tanks: 227
• Naval Power: 77
• Budget: $57,875,170,000

4. India

Indian army soldiers of Sikh Light Infantry Regiment march during the Republic Day parade in New Delhi, India on 26 January 2011. The day marks the anniversary of India’s adoption of a democratic constitution. (AP Photo/Manish Swarup)

• Power Index: 0.4346
• Active Frontline Personnel: 1,325,000
• Total Aircraft: 1,962
• Tanks: 3,555
• Naval Power: 170
• Budget: $44,282,000,000

3. China

A Chinese soldier is reflected on a window glass as he stands guard during a media oppotunity for the coverage of China’s attack helicopter Z-9WZ at a Chinese Liberation Army base last year. (AP Photo/Andy Wong)

• Power Index: 0.3351
• Active Frontline Personnel: 2,285,000
• Total Aircraft: 5,048
• Tanks: 7,950
• Naval Power: 972
• Budget: $129,272,000,000

2. Russia

Wearing Red Army World War II-era uniforms, Russian troops march in the annual Victory Day parade at Moscow’s Red Square, Friday, 9 May 2008. (AP Photo)

• Power Index: 0.2618
• Active Frontline Personnel: 1,200,000
• Total Aircraft: 4,498
• Tanks: 2,867
• Naval Power: 224
• Budget: $64,000,000,000

1. USA

A US Army soldier holds keys of Saddam Hussein’s Al-Faw palace at the Camp Victory Complex in November 2011. (AP Photo/Khalid Mohammed)

• Power Index: 0.2475
• Active Frontline Personnel: 1,477,896
• Total Aircraft: 15,293
• Tanks: 8,325
• Naval Power: 290
• Budget: $689,591,000,000