der Oberstleutnant
lieutenant colonel
An officer rank in the Bundeswehr and other armies that stands between major and colonel.
Der Oberstleutnant gab den Befehl zum Aufbruch.
The lieutenant colonel gave the order to move out.

lieutenant colonel
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lieutenant colonel
An officer rank in the Bundeswehr and other armies that stands between major and colonel.
Der Oberstleutnant gab den Befehl zum Aufbruch.
The lieutenant colonel gave the order to move out.

The rank 'Oberstleutnant' (lieutenant colonel) is composed of the ranks 'Oberst' (colonel) and 'Leutnant' (lieutenant). It refers to a single officer rank that is hierarchically below colonel.
Er wurde nach langjährigem Dienst zum Oberstleutnant befördert.
After many years of service, he was promoted to lieutenant colonel.
In written usage, especially in official or military documents, the abbreviation 'OTL' is often used for 'Oberstleutnant' (lieutenant colonel).
Auf dem Dienstplan stand: OTL Schmidt, Tagesoffizier.
The duty roster said: OTL Schmidt, duty officer.
In direct address, the full rank is used. The correct form of address is 'Herr Oberstleutnant' (Mr. Lieutenant Colonel) for a man and 'Frau Oberstleutnant' (Ms. Lieutenant Colonel) for a woman.
Herr Oberstleutnant, Ihr Befehl wurde ausgeführt.
Lieutenant Colonel, your order has been carried out.
major
'der Major' and 'der Oberstleutnant' are both military officer ranks. They can be confused because they are close to each other in the hierarchy. A Major ranks below an Oberstleutnant. So the Oberstleutnant is the higher rank and stands between Major and Oberst. When it comes to hierarchy or orders in the military, you should distinguish carefully between the two.

Der Oberstleutnant übernimmt morgen die Leitung der Besprechung.
The lieutenant colonel will take over leading the meeting tomorrow.
Beim Appell meldet der Major die Ergebnisse der Übung.
At roll call, the major reports the results of the exercise.