I suppose a key question one might ask here is if Americans are made of the same stuff we were back during WW2?
I was not alive during that time, but I was raised and grew up around many who were. They often expressed disappointment in the younger generations, thinking that the younger generations were psychologically weaker and not able to handle hardship and adversity as well as they did when they had to.
I've heard criticisms of Americans being too soft, hedonistic, lazy, fat, excessively driven by comfort and luxury and instant gratification.
I've seen recent articles that the military is having trouble getting recruits. (When I tried to join the Navy in the 1980s, recruitment was pretty high at that time, but now, not enough people are joining up.) Another issue which has come up is that American high school kids are suffering a weight problem. Too many in that age group just aren't in very good physical shape, and the military sees this as a potential national security risk (according to some articles I've read lately).