<p>Bottom line, more doors are open to US citizen in aerospace, electrical, and civil. No one will be willing to teach you the top secret that must be kept within its own government to someone who is potentially a spy or intention to give access to espionage. Its just aerospace industry are in someway tied to government and wants their employee to have well rounded to get into any project whether it be for public commercial or for the goverment. Aerospace and civil is only two major engineer area that will limit your scope of job search but rest, you can easily find job… just not government related with top secret or knwoledge pertaining threat to national interest.</p>