Speed:
Quickdraw – aim down sight faster
Sleight of Hand – reload faster
Agility – move faster
Marathon – sprint for longer
Stalker – move at faster while aiming down sights
Handling:
Strong Arm – throw grenades farther, decrease the cook time of grenades
On the Go – reload while sprinting
Reflex – switch between primary and secondary weapons quicker
Steady aim – increased hip-fire accuracy
Dexterity – weapons ready faster after sprinting
Stealth:
Takedown – killing enemies won’t reveal their death skull to team mates
Blind Eye - provides stealth against aggressive killstreaks
Off the Grid – immune to SAT-COM and radar pings
Dead Silence – make less/no noise
Ghost – no red name when targeted
Awareness:
Recon – spot enemies through explosives and hitmarkers
Scavenger – resupply
Sitrep – detect enemy equipment
Awareness – hear enemies easier
Wiretap - upgrades your SAT-COMs by hacking into active enemy SAT-COMs
Resistance:
Lightweight – no fall damage
Painkiller – faster health regeneration
Toughness – less flinch when shot
Tac Resist – resistance to flash, stun and EMP effects
Blast Shield – increased explosives resistance
Equipment:
Tac Reset – extra tactical grenade
Lethal +1 – extra lethal grenade
Fully Loaded – max ammo capacity
Three attachments on primary weapon
Danger Close – increased explosive damage
Elite:
Gambler – 1 random perk
Hardline – earn Killstreaks quicker
Ping – when you kill an enemy it will locate enemies near by the body
Overkill – choose two primary weapons
Deadeye – consecutive kills increase the chance to deal more damage with guns
Best Answer
The trophy system in Ghosts extinction mode nullifies the ranged projectile launched by Scorpion enemies. Here's the quote from the COD wiki:
I've used these quite a few times, they very helpful in keeping an area clear of the scorpion's gas. Since the gas damages almost everyone on your team, a well-placed trophy can benefit the whole team. They come in handy for times such as repairing the drill. Just set the trophy (system) near the drill and it will destroy a few of the gas projectiles before being destroyed. I'm not sure the exact number of projectiles it will destroy, but I've observed it to be around 2-5 projectiles.
Sources: Personal experience playing COD Ghosts Extinction and the links in the answer above.