R1: Woods ( Think of Rambo: First Blood)
R2: Populated City ( Both don't care about killing innocents, bloodlusted) Times square
R3: Mountains in afghanistan
R4: Octagon H2H
R5: Frank has his KA-BAR and Dex has 5 throwing knifes
Frank has all his MARSOC gear
Dex has all his FBI/SWAT gear.