The Norks on the attack are ruthless, read the history of the Korean War for details of their atrocities. They have used bombings and assassination squads.
Terrorist attacks will be launched on US bases behind the front line if NK goes all out.
My dad got to spend some playtime in the Pusan Perimiter area between the invasion and Inchon. Things were mass confusion early on. They were glad about having the Marine brigade as a supplement to the Army in keeping the norks out. He had been overseas so long that the AF sent him back to CONUS war or no war. The bureaucracy marches on.
I worked for nine years with a retired Sgt Major who had been to Guadalcanal, Iwo, The Marianas and Korea, too.
The Reds were frantic to drive the 1st Division away from the Chosin and the other two reservoirs due to them operating the Japanese atom bomb facilities in the regional mountains that used the power from hydro plants for uranium separation. North Korea has low grade uranium bearing minerals so the Kims did not have to import.
The Nork reds are brutal subhumans.
PS, that retired guy knew Chesty Puller and didn’t like him.