How long to get a Bachelor's degree then a Master's in Aerospace Engineering?

Yes it is possible. You will need to take some pre-requisites from Aerospace engineering that you may have not taken in Chemical Engineering such as fluids mechanics and fluids dynamics, vibrations and other mechanics classes. You may even get permission from the department to skip some of those classes.

I did just that. I studied Industrial Engineering and then got two engineering Masters Degrees in different engineering fields. Also in the real world, an engineer can work as any engineer.

For example, my first job out of college was as a mechanical engineer, and then a year later manufacturing engineer, and then process engineer, and then chemical engineer, and then I even picked up additional job titles and responsibilities as an environmental engineer. I was also interviewed for and offered a job as a civil engineer in highway design/construction. Two of my friends studied mechanical engineering and bio engineering, respectively.

Both got their first jobs as software engineers. My friend in biomedical engineering got her first job as a mechanical engineer. My friend in aerospace engineering got his first job as an industrial engineer.

My friend in industrial engineering got his first job as an electrical engineer.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.