Red alert reloaded allies mission(18) tanks gone m.a.d crashes everytime right after the chronosphere is built Edit** - mission can still be beaten without the chronosphere but it specifically states to build one. I assume the developer meant for you to use it to transport the stolen vehicle to the drop point as you are chased by the enemy once you steal the tank.
For that same mission it seems the mission end triggers for any of the objective buildings. I destroyed the construction yard first and had the same result. Also thank you Icho I would have never beat the flamedancer prototype and final set 1 mission without your videos. I thought I was bad at red alert due to me being like 5 years old when I first played but apprently I just suck lol.