Mechanical Engineering

Hi,
After completing Diploma in mechanical engineering you may join lateral B.Tech course in the Aeronautical Engineering.
To be eligible, you need to score minimum aggregate of 60% marks in the diploma course. You need to sit for Lateral Entry Entrance Test or LEET which is conducted at state level. Some colleges and Universities too conduct their own lateral entry tests.
Some of the colleges offering lateral B.Tech course are :
-MERI College of Engineering and Technology
-Janeta Subash Institute of Technology
-Guru Tegh Bahadur Institute of Technology
-IIMT College of Engineering
-Amity School of Engineering and Technology
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Wish you luck!

With no single thought, you should opt for Thapar University. It is better than Manipal in every manner. It is one of the oldest university with highly trained faculty and staff which is always there to help students. The infrastructure is amazing and beautiful. The hostel location, playground, etc. is extremely good. Placement cell is very good. Big companies like Maruti, TATA are a part of it. Thapar University strives to maintain an environment that encourages scholarly inquiry and research, a spirit of creative independence and a deep commitment to academic excellence. It's students are unique individuals with different interests and aspirations. Today, it is recognised as a premier deemed universities imparting technical education of the country and the best of its kind in the North-Western region of India. It is an example of pioneering experiment of joint venture between public and private sector in Higher Technical Education. TU is a unique campus with extraordinary potential for development of indigenous technology and its transfer to engineering industries.

First of all, you need not do B.Tech and M.Tech to join Indian Army as technical officers. You have following options to join Indian Army as a commissioned officer:
(a) Join army through NDA and chose technical corp after completion of training at NDA & IMA. Army educates selected candidates to become mechanical and telecommunication engineer. Selection is based on NDA exam conducted by UPSC after B.Tech/M.Tech.
(b) Join OTS Chennai in 10+2 Technical Direct Entry scheme. This is open for male candidates who have passed 12th Class with physics, chemistry and mathematics with not less than 70%. Those who make it in merit list based on marks undergo SSB for selection. After 5 years at OTS and CME-Pune or MCTE or MCEME Secunderabad, candidates get engineering degree and job with starting salary of CTC of Rs 6+ Lakhs.
(c) University Entry Scheme to join in the final year of B.Tech degree.
It is recommended that you go for option (a) or (b). You will get B.Tech degree from JNU on the expenses of the government of India. Indian Army sponsors engineers for post graduation degree in IITs based on the performance in Army.