Related Clues:

• Not optional: Abbr.
• Necessary (Abbr.)
• Necessary: Abbr.
• Abbr. in some class descriptions
• Not opt.
• Necessity: Abbr.
• Mandatory: Abbr.
• Needed: Abbr.
• Not elective: Abbr.
• Mil. supply order
• Must-take coll. course
• Not optional: Abbr
• Like core courses: Abbr
• Not opt
• Like some univ. courses