General Bell is speaking out against the OPCON transfer to South Korea:

General B.B. Bell

A former commander of the U.S. Forces Korea (USFK) on Friday expressed his opposition to the planned transfer of wartime operational control, or Opcon, from the United States to South Korea, citing significant threat stemming from North Korea’s nuclear weapons development.

Gen. Burwell B. Bell, a U.S. four-star general who commanded the USFK from 2006 to 2008, said in a written interview with a Korean correspondents club in the United States earlier this month that he opposed the wartime Opcon transfer based on recent assessments that Pyongyang has made great strides in its nuclear weapons program that has made a conventional weapons-based deterrence model obsolete.  

Only the United States, he said, possessed the nuclear weapons and deployment capability to respond to the North Korean nuclear arsenal, and this capability can only be effectively planned and exercised in a wartime contingency if the U.S. command stands at the helm of the alliance. In terms of combat operations on the Korean Peninsula, the wartime Opcon transfer was unlikely to be realized, he added. 

Joong Ang Ilbo

You can read more at the link, but from a military perspective General Bell is correct. Does anyone think that in a real contingency on the Korean peninsula a ROK general is going to be directing U.S. stealth bombers, space assets, nuclear weapons, and other strategic capabilities that only the U.S. has?

However, the OPCON transfer is not a military issue for the ROK, it is a political issue. All the issues that General Bell brings up, the ROK left could care less about. They don’t think North Korea would ever attack the ROK and that the U.S. military is actually a barrier to reunification. The OPCON transfer is one of the things they need to move towards the removal of U.S. troops from South Korea and seeking their confederation with North Korea.