This is the 2906th most frequent Russian word.
военнообязанных
Persons liable for military service.
The term 'военнообязанных' refers to individuals obligated for military service, used here as a noun in the accusative plural form referring to the group of conscripts.
На военной базе собирают всех военнообязанных для учений.
All conscripts are gathered at the military base for exercises.
In this sentence, 'военнообязанных' again functions as a noun referring to persons under conscription duty in the country, in the genitive plural form.
Военнообязанных в стране должно проходить профессиональную переподготовку.
Enlisted personnel in the country must undergo professional retraining.
Here, 'военнообязанных' is used in the dative plural form, referring to individuals obliged for military service when describing benefits designated for this group.