For what it's worth, this Jewish lawyer and civil libertarian thinks it's kind of a shame to make, so to speak, a federal case over the Mount Soledad Memorial. Aka the Mount Soledad cross.
If someone sees the cross and knows nothing about it, then they won't know it's on federal land, and thus won't have a reason to read it as a government endorsement of religion. If they see it and know it's a war memorial, then what follows? American military cemeteries are full of crosses. This is because they are full of dead American soldiers, most of whom were Christians. Seeing a plain giant cross used as a war memorial is more likely to call up memories of military cemeteries than of churches.
In the article I just read, the attorney who fought against the cross for 15 years (!) says it's "a great day for religious tolerance." I would hardly call it a great day, or a great devotion of 15 years, for any kind of tolerance.