Gwen:
It sounds like your dad is in good hands. The bronchoscopy, if positive, will allow the docs to see what kind of cancer your dad has. If it is not positive, they will just call it inconclusive or non diagnostic.
At least, it sounds like it is not widespread. I have heard of others who have had some node involvement and cancer limited to the lung, who have had radiation and chemo, followed by surgery. At this point, it sounds like your dad has a good shot at a cure, especially if he has enough strength to withstand treatment.
You might ask about image guided radiation therapy (IGRT). It is a targeted form of therapy that would be used to kill the malignancys only and would not affect the rest of the lung as much. This therapy is not as debilating as conventional radiation. I just finished 33 treatments of it and did pretty well. The thing is, I am not sure if it can be used on a tumor plus 2 involved nodes. It is worth looking into, I think, because it may be less taxing on your dad. Chemotherapy would probably come after the IGRT.
I just took a quick look at Walter reed Website and see that they don't have IGRT yet, but they do have Intensity Modulated Radiation Therapy (IMRT) whcih will also spare healthy lung tissue.
Don M