der Offizier
officer
A soldier in a leadership position in the military who holds a rank from lieutenant upward.
Der junge Offizier führte seine Truppe sicher durch das Gelände.
The young officer led his troop safely through the terrain.

officer
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officer
A soldier in a leadership position in the military who holds a rank from lieutenant upward.
Der junge Offizier führte seine Truppe sicher durch das Gelände.
The young officer led his troop safely through the terrain.

Careful: 'Der Offizier' (officer) is not a police officer. The English word 'officer' can mean a police officer, but in German only 'der Polizist' is correct for that. An 'Offizier' is always a high-ranking soldier or a leadership figure on a ship.
Ein Offizier der Bundeswehr hielt eine Rede.
An officer of the German Armed Forces gave a speech.
The word belongs to a group of job titles that come from French and end in '-ier'. This ending helps you recognize the word as referring to a person or profession.
Der junge Bankier investierte in neue Technologien.
The young banker invested in new technologies.
In a military context, 'Offizier' (officer) is often combined with ranks or branches of the armed forces. Typical phrases are 'zum Offizier befördert werden' (to be promoted to officer) or 'ein ranghoher Offizier' (a high-ranking officer).
Er wurde nach seiner Ausbildung zum Offizier ernannt.
After his training, he was appointed an officer.
When 'Offizier' (officer) is mentioned in connection with ships, navigation, or the 'Brücke' (bridge), the meaning refers to the merchant navy. The 'erste Offizier' (first officer) is the captain's deputy.
Der Kapitän besprach die Route mit dem ersten Offizier.
The captain discussed the route with the first officer.
team / crew
'die Mannschaft' and 'der Offizier' are opposites in a military context. There, 'die Mannschaft' means the soldiers with the lowest ranks. 'Der Offizier', by contrast, is a soldier with a higher rank and a leadership position. The words can be confused because both belong to the military. The important point is: here, 'Mannschaft' refers to a group or rank group, while 'Offizier' refers to an individual person with a leadership rank.

Der Offizier erklärte den Soldaten den Plan für den nächsten Tag.
The officer explained the plan for the next day to the soldiers.
In der Übung bekam die Mannschaft klare Anweisungen.
During the exercise, the rank-and-file soldiers received clear instructions.