I'm calling BS.
These guys had 18 years prior to Bo to establish an attitude and a personality.
These guys are young adults. Act like it.
It's partly a societal thing.
In 1944, a future U.S. Senator by the name of George McGovern was the same age as Alex Lewis is now. He was given a four engine bomber, nine crew members, 4,000 lbs. of bombs, and then held responsible for all of that while thousands of enemy troops tried to kill him from the ground and in the air.
Now, in 2015, many think it is too much for a person that age to be able to handle a smart phone if someone gets cranky with them. These are different times, I guess...