This mission is pretty intense. It took me 7 attempts to finish it with all secondary objectives completed and with acceptable losses (I lost about 900 points of units).
It is possible to finish this mission AND hold on to India. But you will have to set up your defenses as quickly as possible, and you will need to micro those units as if your life depends on it.
Put some flamers, medium tanks, autocannons and inf on the hilltops. Position them in a way that they can be only shot at by units on the hill. At point blank range, your flamers will dominate the enemy units. Secure the town on the left flank with your starting Legion FAMAS in AMX10 and 4 AMX30B2. Secure your left flank with helicopters.
That strategy works very well if you set up your positions before the enemy arrives. You will also need rolands/chaps for AA defense. Personally I would use the AMX30B2s to help my 2 heavy tanks + infantry defend India. As an alternative, a couple of well placed special forces infantry in the town in Juliett would be sufficient to secure the left flank (the FOB keeps them healthy).
If you have good recon, you will be able to use helicopters effectively as long as you avoid the AA units. the rockets will usually demoralize an incoming attack force which makes them more combat ineffective and easier to destroy.
Edit: btw there's already a thread about this topic: http://www.wargame-ee.com/forum/viewtopic.php?f=12&t=9835