Anyway, try the below possible solutions one-by-one:

Try restarting your computer and then verifying the integrity of the game cache for Arma 3.

1. Restart your computer and launch Steam
2. From the Library section, right-click on the game and select Properties from the menu.
3. Select the Local files tab and click the Verify integrity of game cache... button.
4. Steam will verify the game's files - this process may take several minutes.

Try all of the possible solutions listed on the Arma 3 Unusual process exit article on the Bohemia Interactive Community Wiki.

Try switching to and playing on the profiling game branch. After downloading new data verify the integrity of the game cache.

• profiling branch (special performance + profiling build - requires access code: CautionSpecialProfilingAndTestingBranchArma3), alternative download of needed binary possible from Dwarden's dropbox

Next, you could try to use this solution, called delete your game profile.

1. Go to C:\Users\*username*\Documents\Arma 3
2. Copy all files
3. Delete yourprofilename.vars
4. Return back your profile settings
5. Launch the game

Try to delete your profile folder (create a backup) a try to start the game.

The file yourprofilename.vars.Arma3Profile must be deleted.
Path: C:\Users\*username*\Documents\Arma 3

So, there is some next solutions.

try to decrease your graphic quality (if you're using ultra set high or medium). It´s possible that your have no more space on your GPU.
reinstall your GPU drivers

Okay I will try those when I get home and send you the crash report. ETA 9PM EST

This was my first error report, I tried verifying my game cache and all files were verified. I tried replacing all the classnames of the units and still crashes. I tried modded and unmodded as well with the same results. I'm not sure exactly what the issue is but it only does it on certain missions. Could be a limit issue with the amount of triggers or objects on the level? I wasn't able to understand really what was wrong from the crash dump.

The more objects you have in mission, the more file size will be spend so be careful during creating the missions.

How many MB you mission has? I´m afraid that your GPU is not strong enough to keeping really big amounts of mission features.

The mission.sqm file that I was importing was only 38kb binarized, and 113kb unbinarized. I've tried lowering the settings to minimum and it still crashes. I tried to delete specific sections of the sqm file before importing and had some success. There appears to be a problem with the actual units in the mission being imported from the file. I'm able to get to the third unit as far as importing goes until it crashes. So as of now I'm trying to literally recreate the mission from the old file in the Eden Editor manually to see if an error will occur during the actual editing process. Though it is confusing why the old mission won't import correctly.