The Specialist Issue Weaponry is available by pressing both L1+R1
This Trophy Requires you to get 10 Medals based on the Special Issue Weaponry
Some examples are as follows: (Confirmed)
• Bully - Killed 2 or more enemies rapidly with the ballistic shield (Ajax) - Easiest on Hardcore
• Malpractice - Killed 2 or more enemies rapidly while stimmed by your TAK-5 (Crash)
• Boomer - Killed 2 or more enemies rapidly with the War Machine (Battery)
• Tag and Bag - Killed 2 or more enemies rapidly who were puled by your Vision Pulse (Recon)
• Overdone - Killed 2 or more enemies rapidly with the Purifier (FireBreak)
• Rabid - Killed 2 or more enemies rapidly with the K-9 Unit (Nomad)
I noticed the theme of the medals is "Kill 2 or more enemies rapidly" so below are possibly the other Specialist Equipment Based Medals, If anyone can confirm that would be great
Possible Medals (un-confirmed)
• Kill 2 or more enemies rapidly with the Tempest (Prophet)
• Kill 2 or more enemies rapidly with the Grav Slam (Ruin)
• Kill 2 or more enemies rapidly with the Annihilator (Seraph)
• Kill 2 or more enemies rapidly with the Barricade (Torque)
Just get 10 of any of these medals (They Don't have to be the same medal) and *Ding* There is your trophy :D
Trophy Should Unlock not long after gaining the 10th medal or at the end of the game!
You Can See how many medals you have by pressing options in the multiplayer menu and going to Barracks then selecting Medals then moving over to the Specialists Section