Is this through the military or civvy? I've a good mate who's now an official tour guide for one of the civvy firms. He's pretty good at it too plus he did 25 years in 2 Para so he comes across in a language that squaddies understand.
We do lots of battlefield Tours Battlefield Studies and Staff Rides. We are best known for the Realities of War Tours we run for the ITG and ITCC, but we also do all sorts of other tours to worldwide from Belgium to Burma(*) and France to the Falklands.
I am happy to provide advice on possible locations and the bid process even if you choose to organise and administer it yourself.
* (Currently we only go to Burma for Remembrance tours, but may in the future be able to offer staff rides and battlefield studies)