1)is your commandijg officer is medical doctor? If so you can't without the spouse's consent.
Even if you weren't a medical doctor, it is not done to share such sensitive and personal information without the person's explicit permission.
2)yes your wife can refuse to give her medical documents reports to any one.
3)The right to privacy is protected as an intrinsic part of the right to life and personal liberty under Article 21 and as a part of the freedoms guaranteed by Part III of the Constitution.