The begining of the Himallaya mountain range it means "Death of Hindus". Most of Afghanistan is up about 2000-3000mtrs going up to about 5000mtrs these a conditions not condusive to parachuting. Kyber Gorge 1976
If you want to insert forces a long way away quickly hen an airdrop would be suitable (recent French drop in Africa). Otherwise a helli is better and much simpler to resupply and pick up the troops after. But mainly we no longer have the ability to do more than one activity at a time. Also you need to be sure that your enemy does not have a credible air defence even if it is only shoulder launched.
As for Hindu Kush I seem to remember an air drop in the 30s by the Indian Army.
CLACKER, a joint working group comprised of the Women's Institute, Peter Mandelson, and representatives of the Parachute Regiment, asked this very same question, when faced with the issue of lack of funding for teeth arms regiments. At the meeting it was voted that, indeed, the term Parachute Regiment is a misnomer. It was found that institutional sentimentality had prevented the abolishment of the regiment. Furthermore, it was also found -- upon reading a report written by the Black Disabled Transgender Alliance -- that the Parachute Regiment was failing completely in issues of inclusivity and diversity. Therefore, it was proposed that by the end of 2009 the Parachute Regiment would disband, sell its parachutes to Mozambique, and merge with the ACC to become the ACFC (Army Catering and Fighting Corps). It is hoped that a more inclusive, culturally sensitive regiment will emerge that will positively welcome applications from all communities, irrespective of gender, disability or sexuality. A white paper has been earmarked for reading in the Commons after Easter 2009.