Which of the following is NOT an acceptable acronym for ladies serving in the military?

The correct answer is WAM. You do not ever want to refer to a Woman Marine as a WAM. This is a highly derogatory term regarding the fact that women in general have a wider posterior than most men. Remember, ladies of the Marine Corps are training in martial arts, have one or more weapons and know how to use them, and can most likely outrun you! The most acceptable thing to call a woman Marine is simply Marine. Referring to them as Woman Marine or Lady Marine is also acceptable, as is Ma’am

The other acronyms are:

WAVES Navy Women Accepted for Volunteer Emergency Service

WAC Army Women's Army Corps

WAF Air Force Women (in the) Air Force

Some may believe these are obsolete or archaic terms; however, they are still widely in use.