VAAR 852.219-11 852.270-1, Representatives of contracting officers 852.236-80 (Alt. I) 852.270-1, Representatives of contracting officers 852.236-80 (Alt. I) https://www.va.gov/oal/library/vaar/vaar852.asp#85221910 852.232-70 through 852.232-71 Part 852 852.232-70 through 852.232-71 clause VAAR part 852