Gee, it might have something to do with the fact that that all branches of the US military spent much of the Cold War strapping nuclear warheads to everything they could think of regardless of practicality, in service of building up a hideous arsenal sufficient to extinguish most life on Earth, coupled with the simple fact that since 1945 the United States has been the most warlike nation on the planet, coupled with a national culture that more or less worships the military and believes that violence is the solution to all problems, and regularly features persons and sentiments as linked below on national television and as candidates for high office.
It’s no coincidence that the same Presidential bright spark who claimed that Islam “is a religion of peace” also claimed that “[the USA] is a peaceful nation”. The latter statement is actually far more ridiculous, given that “Islam” is a slippery, amorphous concept that is difficult to get a hold of to make such claims about one way or the other, whilst the United States of America and the activities of its federal government are much more well-defined and susceptible to analysis.