Babbleship

Captain, you're under attack! The enemy has sent a fleet of 5 babbleships to attack you from the ocean. The enemy's ships are positioned on a 10 by 10 ocean grid. Each target has a corresponding letter and number coordinate. To pick a target, choose a letter A through J, and a number 1 through 10. For example, D-4, B-7, or J-2. Can you sink all the ships before you run out of ammunition?