Perhaps you mean a nursing assistant or medical assistant? An RN is not a 2 year degree.
There are many community colleges in the US that offer 2-year associate degree programs that allow you to take the NCLEX exam to receive a Registered Nurse license. I know this for a fact because I graduated from one of these programs, passed NCLEX and am a Registered Nurse. I have a bachelor's in another field and start classes for my Bachelor's in Nursing in September....but even if I didn't (like many of my classmates) we are still qualified to take the NCLEX after 2 years of study....