Today we make it a point to remember all of those who died in service to their country.
This is the thing that separates Memorial Day from Veterans' Day, the latter of which is meant to honor all of those who served their country and fought her wars, including those who survived the experience. Memorial Day, however, is specifically set aside to commemorate those who died in service to their country, making the ultimate sacrifice of laying down their lives so that the rest of us might be free. The preservation of liberty often but not always involves the death of those who are willing to fight for it.
I'm personally thankful for those who were willing to make this ultimate sacrifice. "Lord, make us worthy, willing, and able to step up to the plate like our forefathers. And please, Lord, keep us free. Through Christ our Lord we pray, Amen."