For becoming  a doctor  in Indian Army you can apply in AFMC pune. Armed Forces Medical College is a premier medical institute. On successful completion of MBBS Course from AFMC the medical cadets join the Armed Forces Medical Services as Commissioned Officers in one of the three services, viz. Army, Navy and Air Force.

The Candidates who will qualify NEET will be shortlisted to appear in ToELR (Test of English Language, Comprehension, Logic and Reasoning), a psychological assessment test cum interview to get admission in AFMC.

You can refer the below given link for the futher information.

AFMC

Good Luck!

Hello Anshul,

To join the Indian Army as a doctor, you must study in AFMC.
AFMC stands for Armed Forces Medical College situated in Pune. Earlier, AFMC used to conduct their own exam but not any more. Now, admission is based partly on your NEET Exam.
Eligibility Criteria:
1. He/she must be a Citizen of India.
2. He/she must be unmarried throughout the course.
3. He/she should be medically fit according to the criteria issued by the Ministry of Defence.
4. He/she should have completed 17 years of age but should not be more than 22 years of age (24 years if you're doing a BSc degree and are in final year/have passed).
5. Achievement of atleast 60% in PCB and 50% individually in each subject along with English. Also, he/she should have passed all the subjects in their first attempt. Passing in Mathematics in 10th standard is also required.
Admission Process:
1. When you apply with your NEET result, you are required to take the ToELR test which is a computer based exam testing you in English, Logic and Reasoning. It consists of 40 questions to be done in 30 minutes.
2. The NEET Exam result and the TOELR Exam result are added and divided by 4 to get a score out of 200.
3. An interview worth 50 marks is also held.
4. A merit list is prepared according to the total marks and domicile has no role in it whatsoever.
There are only 105 seats for boys and 25 seats for girls.

For furter information, please refer to this link.

https://medicine.careers360.com/articles/afmc-mbbs/amp