Sniper Elite V2 Remastered

Easiest way to do this is the following settings:

Go to cooperative mode and select Bombing Run
Level Kopenick Launch Site
Difficulty Custom
Enemy Skill Rookie
Ballistic Realism Simple
Tactical Assistance Full

There are 5 parts you need to get labeled A, B, C, D, E. You can only carry one per person at a time.

The order you should get them in is D E C B A.

Basic strategy is to run up the right side into the trenches first. Have one person follow the path through the trenches and stop at the point where it says D there will be 3 guys here and you should headshot them all with your pistol. When they are all dead run ahead towards the E point and at this point the second person should get to the D part (this is done by pressing A in front of the part and a gear symbol on the screen will appear showing you have it). At this point you one of you will have D and the other E go back through the trenches and when you come back out if you hug the wall you can sprint by holding own the left trigger without alerting anyone.

At this point go up to the truck and press A which will install the part. Refill your ammo and head towards C which is behind a chruch door. Walk up slowly or you will alert people and slowly have one person pistol the 3 people inside. Sometimes no matter how quiet you are people will spawn behind you. When the coast is clear get the C part which is on the Church altar in a box. Then go towards B which is in a courtyard that will be swarmed by guys. You want to be careful at this point. You can either run and gun and hope for the best or slowly as a team snipe the enemies while the other person gets the part labeled B.

Once you have B go back through the Church you just came and you can sprint back to the truck. At this point you now have 4/5 parts and the only part left should be A. Refill your ammo and a clock will start with 5 minutes. You need to run from the truck away from the area you just were and towards the A. Run as fast as you can and before you get to the final courtyard there will be multiple guys. Find cover and take a few of them out and then have one person go and collect part A while the other person shoots any guys that come out. BE CAREFUL sometimes guys show up on the sides of where the person doing the shooting is trying to defend the co-op partner who is getting part A.

Once you have part A its a small sprint right back to where you just came to the same truck. Install the part and then just stand side by side with your co-op partner near the truck and the mission will end.

Average time for me and my co-op partner was 8 minutes per run. Rinse and Repeat 10 times.

Following up on the other guide posted by anthonyd46:

Go to cooperative mode and select Bombing Run
Level: Kopenick Launch Site
Difficulty: Custom
Enemy Skill: Rookie
Ballistic Realism: Simple
Tactical Assistance: Full

There are 5 parts you need to get, labeled A through E. You can only carry one per person at a time. The order I suggest you obtain them is C, E, D, A, B.

Move to the road curving around to the church. Have you and your team mate both get line of sight of the church entrance (to the right of your starting point). Inside you will be able to see two soldiers to the left (one stands in front of the other), and a solider on the left. When you're both ready and the next thunder strike happens, have the person shooting left shoot through the solider in front around the hip area, which will kill the solider behind them (chest or headshot.) At the same time the person shooting right will kill the solider kneeling looking at a box.

Assuming you pulled this off correctly, have one of you (the better shot) approach the church door with a Welrod drawn. A fourth soldier will come to investigate. You have a moment or two to headshot him. Assuming you one-shot kill that fourth solider, you will not alert guards. Have Player 1 collect part C, while Playing 2 goes toward D and E.

In the D and E section, you will need to crawl through the first area, then you can run all the way to the end to another crawlspace on the right. There are three guards here - you can take them out quickly with the Welrod and headshots. Waiting until thunder strikes seems to not alert the third guard, so crawl out slowly from that crawlspace and take care of them.

After that, leave D for Player 1 to collect, and run down to the E area. There are two guards here, but as long as you use the Welrod and kill from a distance, you will have no issues. Collect E and start heading back.

My friend and I discovered that after you return 3 parts to the car, all enemies will aggro. What you are better off doing is taking out as many enemies as you can before returning the third part to the car.

Around part A who will have at 4-5 enemies - two are at the end of the road (easily killable with a simultaneous kill with both players), one is to the left of A and it easily shootable from a distance from the ruins near the car. In most (but not all) cases, an enemy will come to check out the dead bodies, which gives you the chance to clear one more. There is likely one enemy that you will need to encounter silently as you get very close to A.

Around part B is usually 3 enemies (it can sometimes be two). You can take two out in one thunder sound period if you're lucky, although most of the time as soon as you kill the first one (and always kill left to right), the middle enemy will react to the death and unless you're a brilliant shot, you'll need to take time to chase down the enemy who is now checking the area.

Reunite with your other player at the car once parts A and E are in hand. Put these parts onto the car. Again, as soon as the third one is placed, enemies will aggro, but you if you killed all the enemies discussed in this guide you will only get a random sniper on the ground at the church, and those uphill near D where machineguns are.

The run to and from B is only about 60 seconds, so assuming one player is getting B and the other is killing those uphill enemies and any stragglers, as long as you're playing on Cadet you should have no issue finishing as long as you are both at the car and don't encounter bad luck with being shot to death.

Good luck!