Dear aspirant!

There is not any kind of btech- in airforce . However you may join airforce after finishing your btech- first . The best branch would be Aeronautical engineering is most exciting field. Students who wants to do their career in the field of aircraft or want to join air force should go to study aeronautical engineering. It is helpful for the future in airforce. Also you can complete aeronautical engineering course from Indian Air force academy ( IAF ) . .

For more about aeronautical engineering,visit the below link ;-

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.careers360.com/courses/aeronautical-engineering-course&ved=2ahUKEwiOtpmZss75AhVym9gFHWYKBZYQFnoECAUQAQ&usg=AOvVaw3sEatDrRRFHUxo3ybMYzkY .

Hope it helps you !

Thanking you!!