There's a General Power Of Attorney and there are specific Power Of Attorneys. Most places like banks and housing want a specific power of attorney. Some places will not accept any power of attorney.
The Power of Attorney forms are online and can be printed. You no longer need to go inside the legal office on base if you have a Notary Public closer to you. Navy Federal Credit Union will notarize your forms for free. Some other places will notarize your forms for a fee.
Click HERE for the Special Power of Attorney Forms.