Except for those who acquired the Canadian Forces mess dress between 1968 and 2010, naval officers have always worn the Royal Navy-style executive curl rank insignia on mess uniforms (see Royal Navy officer rank insignia). The colour designations for specialist officers are not used except for naval medical officers who may use a variant of the standard rank slip-ons and shoulder boards incorporating a scarlet red background between the gold braid of their rank insignia and naval medical service officers (nursing officers, pharmacy officers, health care administration officers, social work officers, physiotherapy officers, and bioscience officers) who have shoulder boards incorporating a dull cherry red background between the strips of their rank.