No, it is not bad etiquette. Done with the right timing (not too eager, yet not too late), it shows interest without being a pest.

I would call.

Other possibilities:

1. The unit has been deployed, and paperwork got slowed down.

2. The unit is running out of man-days, pay-periods, or call it what you will...so paperwork got slowed down. (Many Reserve units are very short of working-days right now).

3. A key player in the process got tasked with something more critical, slowing the paperwork.

4. They contacted primary selectees, and are seeing if they accept, or if they meet further screening. You could be a secondary.

5. Or, they didn't select you.

In my Reserve unit, I believe they always did the courteous thing and notified those not selected. I would hope others would be the same.

Good luck!