militärisch
military
Relating to the military, the army, or war.
Die Regierung beschloss einen militärischen Einsatz in der Krisenregion.
The government decided on a military operation in the crisis region.

military
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military
Relating to the military, the army, or war.
Die Regierung beschloss einen militärischen Einsatz in der Krisenregion.
The government decided on a military operation in the crisis region.

The adjective 'militärisch' (military) is derived from the noun 'das Militär' (the military). The ending '-isch' is often used to form an adjective from a noun that describes an affiliation or characteristic.
Die politische Lage führte zu einer militärischen Reaktion.
The political situation led to a military response.
The noun that follows 'militärisch' (military) makes the meaning clear. Words like 'Einsatz' (operation/deployment) or 'Operation' (operation) point to the military. Words like 'Präzision' (precision) or 'Ton' (tone) point to the figurative meaning of strictness and discipline.
Die militärische Übung findet nächstes Wochenende statt.
The military exercise will take place next weekend.
In its literal meaning, 'militärisch' (military) is often combined with nouns that are directly related to the army. Common examples are: 'ein militärischer Stützpunkt' (a military base), 'eine militärische Basis' (a military base), or 'militärisches Gerät' (military equipment).
Für den Transport war spezielle militärische Ausrüstung notwendig.
Special military equipment was necessary for the transport.
In the figurative meaning, 'militärisch' (military) describes a very strict, exact manner. Typical combinations are: 'militärische Disziplin' (military discipline), 'militärische Pünktlichkeit' (military punctuality), or 'ein militärischer Tonfall' (a military tone).
Er erledigt seine Aufgaben mit fast militärischer Genauigkeit.
He completes his tasks with almost military accuracy.
strict
'streng' and 'militärisch' can both describe something as very disciplined and exact. 'streng' is the normal word for people, rules, or requirements that allow few exceptions. 'militärisch' sounds stronger and compares the order or discipline with the military. It fits especially when something seems very precise, harsh, or commanding. For normal rules, people usually say 'streng'; 'militärisch' is more figurative and often somewhat exaggerated.

Beim Training läuft alles fast militärisch genau ab.
In training, everything runs with almost military precision.
Für die Prüfung gelten strenge Regeln.
Strict rules apply to the exam.