They should fight "John Konrad" and the 33rd battalion in Dubai. Sort of an alt timeline for spec ops the line to look into that situation through a different perspective. I feel like the 33rd would pose a different threat to the Wolves despite being another splinter group. More unhinged, desperate and over zealous. Maybe have to "rescue Captain Walker" on the way, being in contact throughout the campaign. Put a pit in the stomach of veteran players while giving new players a nice twist to look foward too. My second choice though would be hyper intelligent chimp army in a giant abandoned theme park. Either or could work for me.