This is one cool Fireteam, I liked their special type of insignia, yet it would've been better if this used newer Spartans, rather than reusing the Hermes. So, here are the supposedly new Spartans:
Wetwork - Equipped with M45D Shotgun
Pathfinder - Equipped with BR85N
Technician - Equipped with DMR
Centurion - Equipped with Hydra Launcher
Whole build seemed okay to me, yet I liked mostly is the Spartans and the turret.