The reason why they're not toasting is because it's super-dumb to do so. They have a huge task ahead and need all their concentration for that. Only fodder, who is crazy about the enemy being completely harmless and "our Tobbi Roppo are invincible", would toast in such a moment, to show how undisciplined and overconfident they are.
And maybe look at the scene in the chapter, and not just randomly dig it up from the shadowy chambers of your mind... An unfinished toast means nothing (again, first sentence).