Coff
The Air Force might be a bit ropey but they have lots of SAMs. Also, as a package, to quote Zulu, there are "millions of them"...
PERSONNEL
Total Population: 23,479,088 [2008]
Population Available: 12,414,017 [2008]
Fit for Military Service: 10,280,687 [2008]
Reaching Military Age Annually: 392,016 [2008]
Active Military Personnel: 1,170,000 [2008]
Active Military Reserve: 4,700,000 [2008]
Active Paramilitary Units: 189,000 [2008]
ARMY
Total Land-Based Weapons: 16,400
Tanks: 3,500 [2006]
Armored Personnel Carriers: 2,500 [2006]
Towed Artillery: 3,500 [2006]
Self-Propelled Guns: 4,400 [2006]
Multiple Rocket Launch Systems: 2,500 [2006]
Mortars: 7,500 [2006]
Anti-Aircraft Weapons: 11,000 [2006]
NAVY
Total Navy Ships: 708
Merchant Marine Strength: 167 [2008]
Major Ports and Harbors: 12
Aircraft Carriers: 0 [2008]
Destroyers: 0 [2008]
Submarines: 97 [2008]
Frigates: 3 [2006]
Patrol & Coastal Craft: 492 [2006]
Mine Warfare Craft: 23 [2006]
Amphibious Craft: 140 [2006]
AIR FORCE
Total Aircraft: 1,778 [2006]
Helicopters: 612 [2006]
Serviceable Airports: 77 [2007]
The only way to take North Korea is to go for an uber-version of 'shock and awe' and once the main IADS is down, to bring in Daisy Cutters and AC-130s to level the place. Trying to take it with 'boots on the ground' would be horrendous. Somehow, even though they are p!ssed off with the North Koreans at presnt, I don't think China would sit idly by whilst South Korea and its allies commit mass extinction of the North Koreans.
Its far easier to put PAC3 Patriot and other ballistic missile interceptors onto South Korean soil and ring them in guided missile ships. Containment is the only alternative until the North Koreans grow up and stop behaving like petulant children.
iRaven