Every closure-eligible holiday (New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, Christmas, Rosh Hashanah — first day only, Yom Kippur) plus Black Friday, and who was on call, as far back as the on-call calendar has records — including retired providers. Passover and Hanukkah are reference-only holidays the office never closes for and are not included here; Black Friday is included but, unlike the others, doesn't count toward the Call Tallies table's holiday totals.