RSR: Being a vegetarian in the army has been a very small inconvenience as the army is quite accommodating. To day the highest rank to ever had deliver me a vegetarian meal is a Major. (Some may dispute this and say it was L. Colonel but they are just exaggerating). Oh, and the new vegetarian instant meals are quite good.
DSB: Getting a Veggie meal is not guaranteed. I often bring additional food, (granola bars, powdered soup, nuts, and seeds) to supplement my rations in the field.