This is one of my older missions again, created back in 2011 with Red Alert Scenario Editor. Armor Facility was intended to be Allied mission 4, but since I lost interest back then, the project was abandoned. What is left of it, are some standalone missions, and this is one of them.
In this mission, you must destroy the Soviet vehicle production site (underground mission). Use your Engineers to disable those Flame Towers by guiding them to a nearby computer terminal (as you would do in the original C&C Red Alert). The mission is complete when all Soviet vehicles and War Factories are destroyed.
For the curious: I made some changes to this mission due to different issues I came across. In the original version you had to also escape the facility after destroying the enemy vehicles and production sites, but since I wasn't able to create a proper "game winning trigger", I chose to keep the mission more simplified, given the fact that it was intended to be an early Allied mission to begin with.