In Afghanistan the British and Americans are honing their military skills to levels they haven't reached since the 1960s during their adventures in Malaya and Vietnam. The question now is which military philosophy will prevail; the British concept of taking and holding ground or the American approach fast attacks and equally rapid withdrawals.
In Afghanistan the British approach born of generations of experience as an occupying power has the potential to succeed but only if the garrisons they install are sufficiently large to deal with any assault by Afghan irregulars. Leaving garrisons of two or three platoons to hold a town merely invites attack as a force of this size doesn't have enough firepower. If this strategy continues there is a genuine danger of a 'Fort Zinderneuf' style situation where a whole garrison gets wiped out. The easy solution would be to put brigade size garrisons in every town in Helmand province. Unfortunately this would commit the entire British Army to the operation.
The American approach limits casualties and enables the maximum force to be delivered against the enemy. The downside is that just like Vietnam once the Americans pull out, the other guys move back in no matter how much damage the US forces cause. Like the Viet Cong the Afghan warlords will not commit their forces to a set piece battle with the full might of the Americans and British, that would be suicide. Instead they will continue with the guerilla tactics that served them so well against the Soviets.
This leaves the Americans and British trapped in a war they can't win or afford to lose. There is no viable exit strategy, any kind of withdrawal would be regarded as a defeat unless they left behind a government in Kabul that was in full control of the whole country. I think there is more chance of apples growing on an ivy tree than there is of that happening in the next 10 years.
It took Britain about 100 years before she finally gave up trying to subdue the Afghans first time around. It looks as if they didn't learn from that experience.