The correct answer is Air Marshal.

• The highest rank in the Indian Air Force is the Marshal of the Indian Air Force.
• Which is conferred by the president of India after special service during the war.
• The Indian Air Force is headed by the Chief of Air Staff, who holds the post of Air Chief Marshal.
• Marshal of the Airforce -
  • The Marshal of the Airforce is the highest rank of the Indian Air force (IAF).
  • It is a title found during the war.
  • This is the five-star rank.
  • Marshal of the airforce Arjan Singh has been the only Marshal of the Airforce in the IAF.
• Air Chief Marshal-
  • It is the second-largest rank of the Indian Air Force.
  • It is a four-star rank.
  • Only Chief Marshal takes the position of Chief of the Air Staff (CAS).
• Air Marshal-
  • It is ranked third in the Indian Air Force.
  • Many senior officers hold this position.

•  Rank commissioned officer

1. Air Chief Marshal
2. Air Marshals
3. Air Vice Marshals
4. Air Commodore
5. Group Captain
6. Wing Commander 
7. Squad leader
8. Flight Lieutenant (Aviation Captain)
9. Flying officers
10. Pilot officer