This is South Korea's military.
Total Military Force
Active: 686,000
Reserves: 4,500,000
Army (560,000)
HQ: 3 Army, 11 Corps
3 Mechanized Infantry Divisions with 3 Brigades: 3 Mechanized Infantry, 3 Tank, 1 Reconnaissance, 1 Engineering Battalion, 1 Field Artillery Brigade
19 Infantry Divisions with 3 Infantry Regiments, 1 Reconnaissance, 1 Tank, 1 Engineering Battalion, 1 Artillery Regiment
2 Independent Infantry Brigades, 7 Special Forces Brigades, 3 Counter-Inflitration Brigades, 3 SSM Battalions, 3 Advanced Deployment Artillery Brigade, 3 I HAWK Battalions (24 sites), 2 Nike Hercules Battalions (10 sites), 1 Aviation Command with 1 Air Assault Brigade
Navy (63,000)
Bases: Chinhae (HQ), Cheju, Mokpo, Mukho, Pohang, Pusan, Pyongtaek, Tonghae
Air Force (63,000)
4 Commands: Operations, Southern Combat, Logistics, Tactical Reconnaissance Group
Forces Abroad and Foreign Forces
Kyrgystan: 90 (medical staff)
UNFICYP (Cyprus) 1
UNMISET (Timor): 225
UNOMIG (Georgia): 7 observers
UNMOGIP (India/Pakistan: 9 observers
Currently Stationed in South Korea:
US: ARMY - 28,600; 1 HQ, 1 Infantry Division
NAVY - 300
AIR FORCE - 9,420
USMC - 180
Paramilitary (4,500 active)
Civilian Defense Corps: 3,500,000
Maritime Policy: 4,500
North Korea's military.
Total Military Force
Active: 1,082,000
Reserves: 4,700,000
Army (950,000)
Active: 20 Corps (1 Armored, 4 Mechanized, 12 Infantry, 2 Artillery, 1 Capital Defense)
27 Infantry Divisions with 15 Armored Brigades, 14 Infantry Brigades, 21 Artillery Brigades, 9 MRL Brigades
Special Purpose Forces Command (88,000): 10 Sniper Brigades, 12 Light Infantry Brigades, 17 Reconnaissance Brigades
Reserves: 40 Infantry Divisions, 18 Infantry Brigades
Navy (46,000)
Bases: East Coast Toejo Dong (HQ), Changjon, Munchon, Songjon-pardo, Mugye-po, Mayang-do, Chaho Nodongjagu, Puam-Dong, Najin West Coast Nampo (HQ), Pipa Got, Sagon-ni, Chodo-ri, Koampo, Tasa-ri 2 Fleet HQ
Air Force (86,000)
4 Air Divisions. 1st, 2nd, and 3rd Air Divisions are responsible for the North, East, and South air defense sectors respectively. 8th Air Division remains responsible for the North East sector.
Flying Hours: 20 or less
Forces Abroad and Foreign Forces
North Korean military advisors are known to be in some 12 African countries.
Paramilitary (189,000)
Security Troops: 189,000 including Border Guards, and Public Safety Personnel
Peasant/Worker Red Guard: Over 3,500,000 organized on a local level, most with small arms; however many have known to be unarmed. They are known to be organized into brigades, battalions, companies, and platoons.
My source.
That's both their militaries, basically.
Not counting the reserves, NK has 1,082,000 active, and SK has 686,000 active. That's a 396,000 difference, which isn't horribly bad. SK by itself might get lucky and beat NK, but it's not likely. It'd probably need US intervention. Throw in the Reserve count difference, and you had a 596,000 difference. NK will take men aged 17-49 for the Military, and they list the numbers available for service as 5,851,801 by the CIA World Fact Book. SK is listed to have the ability to get men aged 20-49 as 12,458,257 for service. :] SK has about a 48.85 Million Population. NK only has about 23.1 Million Population. SK holds a population advantage over NK, much like the North held one over the South in the American Civil War. However, since war is more technologically based rather than numerically based today, whoever has the more technologically advanced military is likely to win.