Thinking obliquely, have you scoured the unit website for an email address for PMS? Or any other email to a person in the unit where you could introduce yourself, say you have been unsuccessful in getting in touch with X (don’t say “he/she has not responded to my calls or vmails”), and could they please assist you in making contact to schedule an interview. Ditto any other phone numbers. They may be working from home, able to monitor email but not landline phones.
Does the unit have a FB page? Anyone on there who could help? You may not have a FB account, but it is handy when looking for organizations and units, and connecting in an informal way, as is done in the business world.
Give them
at least 5 working days before pulling another school into the loop. COVID has disrupted normal business patterns. And, military people actually take leave, so the PMS might be taking away-from-phone time with family for a week. Military people often have use-or-lose leave, meaning excess leave that if not used by 30 Sep (end of fiscal year), it evaporates. You do not want to be “that candidate” who ventures close to the pestering line.
If no contact despite various approaches after a work week has gone by, try the second school.
I’m trying to help you think of alternative approaches in general, but will send a flare up to
@Montana State Army ROTC as someone who is well-placed to advise. They are very forward-leaning and justifiably proud of their school and unit, so stand by for a recruiting pitch as well.