The key to finding information related to your Soldier in training is knowing his or her unit address. This is true when looking for information on the website and when addressing letters to your Soldier. The unit address has two main parts: The company which is a letter, like A, B or E company. The second part is the battalion, like 2-13 or 1-34. This means 2nd Battalion, 13th Infantry Regiment. Each battalion can have up to six companies. There are eleven training battalions in Basic Combat Training and Advanced Individual Training.