“I remember blast walls not far from runways. They’re supposed to divert energy and debris from explosions upwards.”
To divert jet engine blast.
And exploding ordnance, in an accident. Think 12 foot tall concrete Jersey barriers. I’m thinking of the Alert Pad, at Homestead AFB. I wonder if S. Korea has military alert launch capability from that airport. I know that Portland International had Oregon Air National Guard jets that launched from there. Seems like launch sites might be at a premium in SK