Consider the following premises. For all x_12, x_12 is an office clerk if and only if x_12 will drive a car. For all x_12, if x_12 drives a car, then x_12 is a politician. If Mary were a politician, then David is a soldier. Can we infer the following from them? The fact that Mary were an office clerk does not imply that David is a soldier.
That contradicts the premises. Therefore the answer is no.