To become a Security Guard in America means to be licensed as a Security Guard in an individual US state.
Becoming a licensed Security Guard in the USA is similar throughout the American states: you need to meet basic US requirements such as age, language proficiency, and other usual security license requirements of this nature.
Furthermore, to get a Security Guard license in America, you need to take a state government approved Security Guard licensing course.
Every American state will have a government body that controls a local Security Guard's license.
So, it is these US state government bodies that will have a list of approved state Security Guard licensi