1st 2 generations of Singcars frequency hopping radios were compromised in Korea in 1989 - 90.
Us up on the Dmz with the NORKS jamming us with directed micro wave burst.
Radio sound like a bag of microwave popcorn going off.
Had to use terrian mask to transmit to advoid it.
Gen 2 over came the microwave issue.

A RTO from 2/503rd fell off a dam spill way crossing in East bumfugg somewhere training. Downed in the pool below.
They found his body after 2 or 3 days in just BDU,s
Divers never found the gen 2 singcars in the pool or anywhere in the river .
Never found his wpn.
Never found his LBE.
Never found his ruck with CEOI in it.
Whole 2nd ID had to change CEOI books down to the lowest level.

Lotsa Nork infil types living in South Korea long term and thru their networks schit makes it's way north.