What does a foreign service officer do?

What is the difference between a Foreign Affairs Officer and a Foreign Service Officer?

• While investigating the career opportunities available to a international relations student I stumbled across both of the above; A foreign affairs officer and a foreign service officer. At a glance I can't directly tell the difference between the two, but with further research I have discovered it would appear a foreign affairs officer makes a substantially better paycheck than a service officer, as well as being situated domestically as opposed to internationally. However; This information comes from one particular website and from using a search engine designed to browse US government job openings, when I search for any information outside of these two domains (i.e. googling Foreign Affairs Officer) it would appear the only results that show up are for foreign service officers, as if the two were one in the same. While normally it wouldn't be difficult for me to believe given their similarities in job description and title, as mentioned US government job openings reveal quite the opposite. I was hoping that someone more knowledgeable about the subject might be able to offer some pointers, ideally someone familiar with the field. Thank you!

• Answer:

  Good answers but a little more. Foreign Service Officers are Officers within the State Dept and posted abroad and fall into the FSO pay scale. They must have successfully passed the Foreign Service Exam, Oral Boards and be offered a job as an FSO and agree to worldwide assignment and learn at least 1 foreign language. Foreign Affairs Officers are Civil Servants and have to only successfully pass the Civil Service Exam and be offered a job falling under the Civil Service Pay Bands.