In the Canadian Forces, lieutenant-colonel (LCol, French: lieutenant-colonel or lcol) is a rank for officers who wear army or air force uniform, equal to commander for officers who wear navy uniform. Lieutenant-colonel is the second-highest rank of senior officer. A lieutenant-colonel is senior to a major or lieutenant-commander, and junior to a colonel or naval captain. Lieutenant-colonels are addressed by rank and name and thereafter by subordinates as "Sir" or "Ma'am". In the Royal Canadian Air Force, lieutenant-colonels are often the commanding officer of flying or ground squadrons. * * * *