Kevin DeYoung has a thought-provoking and, I think, helpful post about keeping Memorial Day (Monday) distinct from Sunday.
The points on which he elaborates:
- Being a Christian does not remove ethnic or national identities
- Patriotism, like other earthly 'prides,' can be a virtue or a vice
- Allegiance to God and allegiance to your country are not inherently incompatible
- God's people are not tied to any one nation
- While patriotism can be good, the church is not a good place for patriotism
http://thegospelcoalition.org/blogs/kevindeyoung/2011/05/26/thinking-theologically-about-memorial-day/