Should the travel agency give me a refund?

You should come back, but you must prove that you are an active soldier.

You don't need any legal provisions, as long as you can prove that you are an active soldier, the tour guide will give you a free ticket. Because if there is no free ticket for the tour guide, the travel agency can refuse to refund your ticket because it doesn't know that you are an active soldier. If you can prove that the tour guide gave you a free ticket at that time, it is wrong for the travel agency not to refund it. Although I am also a staff member of the travel agency, I will not only speak for the travel agency, but also talk about it.