My opinion is that the MKI is best use for air superiority -- regardless of opponents at any time, and the Mirage for deep interdiction.
Own The Air To Win The Ground -- So without air superiority, you will not be able to attack enemy ground forces at any level in any situation, CAS and/or S/DEAD.
The reason why helos are not ideal for CAS and S/DEAD is because of speed and altitude limitations base on load, humidity, temperature, and several other factors. That does not mean army helo pilots cannot fight tanks and APCs in support of fellow army soldiers. They can and they will. But why dedicated CAS and S/DEAD platforms are good to have is because they can fly over all terrain and their speed enable them to respond to unplanned situations quicker than helos.
The MIG-21s and -27s are too old to be financially worthwhile for upgrades. India is wise to retire them or at best relegate to training status. That leave the Jaguar to serve as a dedicated CAS platform. I am not going to be make any comparison between the Jag and the A-10 here. The issue and question should be: Will India provide the Army with a dedicated CAS platform ? If the answer is yes, then Jag pilots must be trained in CAS specifics tactics which are not the same as S/DEAD even though both are surface attacks situations.
The USAF defines CAS as 'air action against enemy ground forces that are either in immediate proximity of friendly forces or are within artillery range of friendly ground forces.' CAS tactics requires air assets to be in close coordination with ground forces to reduce -- not eliminate -- the odds of fratricide. As such, CAS tactics need the pilots to be within constant visual contact with friendly ground forces, which of course make them within visual contacts with enemy ground forces, and that CAS pilots must be ready to divert to another battlefield situation when called upon.
Deep interdiction missions do not have this level of obedience to ground controllers. S/DEAD and deep interdiction missions are highly autonomous. These pilots required a different set of intelligence, such as terrain for ingress/egress routes for cover, mobile air defense if there are any, and target type such as fixed land structures or moving troop formations. Fixed land structures increases the vulnerability factor for deep interdiction attackers, which leads back to the problem of how many passes does a target require for destruction. For the S/DEAD missions, fratricide is usually not an issue so the pilots have greater latitude on which direction and altitude they can attack. Open terrain affords moving troops formations greater degrees of movement to avoid attacks from the air, which require the S/DEAD pilots to have some knowledge of CAS tactics against ground troops when they are dispersed like in a battle. Mountainous terrain affords enemy troops cover but beside restricting their latitude of movement, the same terrain restrict the air attackers' movement in terms of ingress and attack directions.
List of active Indian military aircraft - Wikipedia, the free encyclopedia
Tactical air have three distinct missions:
- Air superiority, which is to repulse any enemy air actions.
- Battlefield isolation, which is deep interdiction strikes to deny enemy front line troops their support.
- Direct intervention, which is close air support (CAS) of friendly ground forces.
In looking at the Indian Air Force fleet details, it make logical sense to dedicate the MKI to secure air superiority in any situation, whether to allow the Jags to assist the Army, or to accompany the Mirages to deep interdiction missions. Any successful air campaigns depends on air superiority, which affords other types of air actions freedom from interference from enemy air forces. It does not matter the duration of this freedom or whether this freedom is localized to a particular ground combat action or theater wide level.