Veterans' Day

Is it "s apostrophe" or "apostrophe s"? I believe the former is correct; more than a single veteran is in existence! I attended a meetup live band event last night at a local bbq restraurant; I will have to attend again while I am in an eating mood. Directly after the gym I rarely possess an appetite! And...speaking of appetites it is time for a quick morning trip to Aldi to collect some baking supplies! Indeed, it has been a long time... But it is November!