Lieutenant commander

Lieutenant commander (also hyphenated lieutenant-commander and abbreviated Lt Cdr,[1] LtCdr.[2] or LCDR[3][4]) is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander. The corresponding rank in most armies (armed services) and air forces is major, and in the Royal Air Force and other Commonwealth air forces is squadron leader.

A US Navy lieutenant commander's collar, sleeve, and shoulder insignia

The NATO rank code is mostly OF-3.[5]

A lieutenant commander is a senior department officer or the executive officer (second-in-command) on many warships and smaller shore installation, or the commanding officer of a smaller ship/installation.[6] They are also senior department officers in naval aviation squadrons.