Before fixing the problem, you need to understand it. The "Homecoming" mission is unique. It involves a massive amount of high-resolution texture streaming as the space station breaks apart and you slide down the collapsing trusses. The game engine attempts to pull specific asset files (map geometry, textures, audio) from your hard drive.

Go to Steam -> Library -> Right-click "Call of Duty: Ghosts" -> Properties -> Local Files -> Verify Integrity of Game Files