Who should be honored on Memorial Day?

The day was actually set aside to remember those that died in any of our armed services. Now, it seems to be a day of remembrance for all of those that have passed. So to answer your question, all who want to remember anyone who has died, including confederate soldiers, etc, can be honored.

Memorial Day commemorates all men and women who have died in military service for the United States.
People visit cemeteries to honor their dead, and I know people who visit their dead who did not fall in service to this country, regardless.
You honor who you choose, I certainly would not try to stop someone honoring a soldier from a different side of a war long past. Or current.
When the Kursk went down in August, 2000, all my shipmates and I stood vigil. We didn’t care that they were sailors of a country who was our traditional enemy. They were fellow sailors, dying in the cold dark.
Ideology means nothing to the great presence. We all have to answer that call soon or late.

Sure, why not honor Confederate soldiers? Although their side ultimately lost, they were Americans and the thought for a cause they felt was correct.

I would have a problem memorializing Japanese (or German) soldiers who fought for the Axis in WW2; if the concept of Memorial Day is to commemorate Americans then it would be inappropriate.

Most Confederate states already have holidays for Confederate Decoration day. But it would not be inappropriate to honor Confederate soldiers, especially if you live in a state that does not have a date set aside for that purpose.

All those who died in the line of duty as a member of the U.S.Armed Forces. It’s just that simple.