According to the prosecutor’s office, it's because they're accused of having links to the network of US-based cleric Fethullah Gulen.
Ankara says it was him who orchestrated a 2016 attempted coup.
Those who are facing jailtime include three colonels, eight majors and 10 lieutenants.

Emergency GCC-EU meeting to discuss Iranian aggression
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UN 'deeply disturbed' by strike on Iran school that killed 160 children
Saudi confirms attempted attack on oil refinery, no damage
At least four killed in Israeli strike on building in Lebanon's Baalbek
