The Armed Services Vocational Aptitude Battery (ASVAB) exam is the most important exam to appear and pass in order to join the Military services in the United States of America. It is an entrance exam which everybody has to attempt. The minimum score required for joining the Navy services is 35. The main subjects that are required to study are Arithmetic Reasoning (AR), Math Knowledge (MK) and Verbal Composite (VE). This is known as an Armed Forces Qualification Test (AFQT). Some of the positions in the Navy services include Enginemen, Mechanical Maintenance, Nuclear Field, Operations Specialist and many more. You cannot join any of the armed services if your score is less than 31.