It was my understanding the the Third Law was a necessary consequence of the homogeneity of space, and conservation of momentum.
Second, what would an example be of a non-relativistic, familiar example be of a force that does not follow the Third Law. Am I correct in understanding that drag would not necessarily follow the Third Law, because the magnitude of the force is velocity-dependent? Maybe I should talk in a more elementary tone, so you understand? Where does the opposing FORCE come from when leaving our atmosphere or the moons surface?