The shortcomings of the THAAD missile shield and SBX radar, however, are somewhat worrying. The THAAD originally was tested in the 90s with dismal results at intercepting incoming targets. The system was revamped and proved much more accurate. However this was with simulated targets that tend to be easier to hit than their real counterparts. There's also been criticism of the SBX x-band radar with reports of technological and maintenance problems along with security concerns. It also does not seem to work as well in rough waters, which was its original purpose.