The point is that, to construct locally invariant theories, new fields have to be introduced which are referred to as the gauge fields.

Inspect them for rub marks and blisters; tape or bandage rub marks; clean the skin around a blister, use a sterilised needle to puncture it at its outer edge and press out the fluid, then bandage.

whose god is their belly

What is said of the army here is to be taken also to apply, mutatis mutandis, to the air force and the navy.