Agree on The Pacific. Band of Brothers followed the same guys from training through to the end of the war. By the end, you felt as if you knew them.
The Pacific followed four different storylines, so it was necessarily choppier, and you didn't get to know the men as well.
With The Old Breed is a great book. I was lucky enough to meet Sledge at a book signing in Birmingham years ago and have a signed copy.
To study different techniques for inuring soldiers to suffering and to build unit cohesion, we read
With the Old Breed as well as
Soldiers of Destruction, about the SS Totenkopf Division. The SSTK sent soldiers to the concentration camps for a year before joining the tactical unit in the field, to get them habituated to being around suffering and death.
Two very different techniques. The USMC's program was to push young men physically to the limits, so that, once they pass through it, they feel indestructible. Sprinkle in a bit of devil-may-care machismo, and a heaping helping of unit history ("Marines were the greatest thing since sliced bread and you recruits are standing on the shoulders of giants"), and voila, cohesive unit. The Army very rarely does that, especially not any more, only in specialized units (Airborne, Rangers, Green Berets).