You want a GWOT memorial that makes sense?
1. Stone. Use stone from the various states that lost service members in Iraq and Afghanistan, the colors would also be evocative of the sand in Iraq and the mountains in Afghanistan. Use font and symbology that equates to Section 60.
2. Columns with the recognizable influence of the WTC in NY, Pentagons, and Keystones for Pennsylvania. Use numbers like 9, 11, and 21 to evoke the dates.
3. Center the service members who made the sacrifice. Like the Vietnam memorial, it should make it plain that the real legacy of the GWOT is the sacrifice born of tragedy. You cannot sugarcoat or sanitize that and have a memorial worthy of their memory.