Call of Duty: Black Ops III

The combat immersion is in the safehouse. To get gold you'll need to get at least 27500 points. You don't necessarily need to beat all 16 rounds, depending on how good you are. I got it at the end of round 14, and it took me just over 15 minutes to do.

You'll get time bonuses for finishing each round as quickly as possible. Set the difficulty to Recruit beforehand.

Note that for "Personal Decorator", one of the medals requires you to complete all Campaign challenges, and one of those challenges is to pass all 16 rounds on Realistic difficulty, and there's another medal that requires you to get at least 35000 points.

Here's the loadout I used:

Primary:
Gorgon (LMG)
-BOA 3 Optics
-Extended Mag
-Grip
-Stock
-FMJ
-Rapid Fire

Secondary:
War Machine

Lethal:
C4

Tactical:
2 EMPs

Tac-Rig:
Repulsor Armor (VERY helpful)
Proximity Deterrent

Wildcards:
Primary Gunfighter I
Primary Gunfighter II
Primary Gunfighter III

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Strategy:

Start the rounds as soon as you can every time to get a bigger time bonus.

Simply take down all enemies from where you started the round, and when you need to reload, use the supply box next to you, because it's faster.

When they're all done, rush to activate the next round and refill your ammo. When you get to round 8, you'll encounter a large robot, which you'll need to shoot quite a bit before firing rockets at it, and repeating until it's dead. In the later rounds, watch out for snipers that are on the highest level where the orb is, and take them out first.

The Tac-Rigs I used made it much easier, because there are so many rockets and grenades that will come your way, and it prevents any enemy from coming too close to you. Watch out for the buzzsaws though; they'll still cause you significant damage if they get too close.

The simulator can be accessed in the Safe House. It is the column with the chairs around it.
Simply enter the sim and create a beasting custom load out (you can pick from all guns and grenades). Make sure the difficulty is set to recruit to make this easy. Then just survive the 16 rounds.

You do need to be quick and finish rounds as fast as you can. If you don't you won't get enough points towards the gold.

I did the sim in 24 minutes and passed

Easiest way to do this is to play on recruit and kill all soldiers and robots with head-shots. Kill robots with headshots by shooting their head off then shooting their torso. I recommend using the Locus with Thermal and Fmj, and having an automatic as your secondary to shoot down flying drones.
My score using this method was 40581, you need 27500.

Credit to 'Paul Zap' for the loadout. The training simulator can be found in the Safehouse in Campaign. I was Level 20 when attempting this so that I could cycle through my Cyber Core's mid-fight. Remember to put the difficulty on Recruit and I show my loadout in the video. Simply spam Fireflies and Enhanced Protocol Override whenever possible and reload using the Ammo Crate. The War Machine and XM-5 are great against machinery.

I created this video to help:


Hope this helps.