Depression and the Military?

Ill be going into the Marine Corps in July. However, Ive fought depression on and off for years including a bout of Alcoholism. Ive not been able to resolve it and can hide it fairly well however I was wondering if there was any way to seek help that wont go on a Medical record (Looked at and considered by the Marine Corps)? Whats the best idea on how to handle this? Real Suggestions please