Do you give any credit to the British forces in Iraq? What can they build on that they did right or almost right?
The problem is that the core tactics and equipment were wrong, but even worse, there was a lack of capacity to respond to new and rapidly changing circumstances, and an almost suicidal (certainly homicidal) insistence on sticking to standard tactics, even when there was indisputable evidence that they were not working.
That led to the failure of the campaign, but so fundamental are the faults that the only thing that can effectively be salvaged is a willingness to learn from the many mistakes made. Since the Army, effectively, seems to be in denial, I see no hope of that happening, which means that there is little to build on, and every reason to expect mistakes to be perpetuated.