Your question is not clear. Have you been in training or in combat? I dont think that a vet can help you if you didn't experience the same issue.

If you have been attacked in this way as a normal civilian, well, yes being hypervigiallant about corners and people in a similar situation can be cause for concern and it be PTSD depending on the event you were in.

I think you need to talk to a therapist before going into basic training, you certainly don't want to be misunderstood or further traumatized do you? That could happen.
Try to scedule an appointment with a therapist and talk about what makes you feel this way.

Open Eyes