Awareness of the outside world. I was this many years old when I learned (or forgot & relearned) the difference. Memorial Day, died in service. Armed Forces Day, active and former. Veteran’s Day, all veterans, with emphasis on living veterans. History.Com: How is Armed Forces Day different from Veterans Day and Memorial Day? & Hisotry.com: Veterans Day
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{Backstory. Each morning, people & horses go on a unmounted team walk in the pasture.}
Day 1. Experimented with taking horses out without halters. They are at liberty anyway, so why not.
Rodney: Am I walking? Am I grazing? What is happening? What am I even?
Milton: This is weird. But. What we do is walk. So. I walk.
Day 2. Halter on Rodney, who clearly likes external rules, compared to Milton who has internal rules, see above. Milton remained au naturel due to bug bites on his head in the halter area.
Rodney: It’s all good! Let’s walk!
Milton: I notice Rodney has a halter. I don’t have a halter. I’m not saying I *want* a halter. But. I notice.
Day 3. Halter for Rodney. Loose grooming slip for Milton.
Harmony restored.
Onwards!
Katherine
Virtual Brush Box 
Horses are funny people.