A formal dinner and ceremony having strict rules, toasts and responses. The uniform is always evening dress, unless the unit is in a forward area where the appropriate field uniform is acceptable. It is a unique evening of fraternity open only to Marines or specifically invited guests (spouses are seldom, if ever, allowed to attend). Separate events are held for Commissioned and Warrant Officers, Staff Noncommissioned Officers, Noncommissioned officers, or sometimes it is open to all ranks.