My Father worked for IRS for 35+ years before he retired as a regional Special Proceedures Chief in the grade of GS-15. At no time in a career spanning almost 40 years did he ever have need for afirearm. As with all other US Government agencies dealing with the general public if there was need of any security involved this was provided by uniformed US Marshalls on scene. The IRS employees are essentially accountants, they are NOT cops. They do not make arrests. US Marshalls do so.