Hi. Medical colleges under Delhi University have a 5% defence quota for the following-

1. Wards of defence personnel killed in action

2. Wards of defence personnel disabled in action

3. Wards of serving/ ex servicemen including personnel of police forces who are in receipt of gallantry awards.

With a score of 590, you have a good chance of getting into government medical colleges in Delhi. Maulana Azad Medical College has 10 seats for the same. You can also get admission in Army College of Medical Sciences, Hindu Rao Medical College, University College of Medical sciences. For seat matrix and other required information, kindly visit the official site which is given here-

http://www.fmsc.ac.in/

All the best!