add fields for SRT/HUT/HLT. we'll use them in the next few steps.
add fields for SRT/HUT/HLT. we'll use them in the next few steps.

joncampbell123/doslib,joncampbell123/doslib,joncampbell123/doslib,joncampbell123/doslib,joncampbell123/doslib,joncampbell123/doslib