War Time

If there was a mass mobilisation and you were drafted into the army to start fighting tomorrow, how would your surveying skills translate to the theatre of war? 

For myself, I imagine the post of forward observer would be a risky but interesting endeavour that would have some overlap with my surveying practice, albeit my physical shape might not be adequate for a rapid retreat.

One other role I would assume surveyors would be easy to adopt would be relating to artillery, though nowadays it is probably more software based than good old fashion aiming by a skilled operator.