The Chinook is great for transporting a large number of troops but in this case wouldn’t it had been safer to have used a few smaller and possibly stealth choppers like the one the Seals used to take out bin laden? A drone could be used ahead of the choppers to not only spot potential enemies but take fire from below as a distraction from the Seals choppers. Just thinking.
The airframe is generally tailored for the mission. Since we don’t know what it was, we can’t 2nd guess their decisions...if that’s ever wise in the first place.
The Chinook is the fastest, has the longest range, has the highest ceiling, and is able to carry the biggest load in and the biggest load out.
It’s a mountainous region, and as stated, we don’t know the mission.