Powers of attorney are commonly used in all sorts of business activities, and are very frequently executed on behalf of individuals in the military who are deployed or otherwise unable to act on their on behalf.
The two people involved are designated as either the "principal" or the "agent." The principal is the person who designates that another person -- the agent -- is authorized to act on their behalf for whatever business the power of attorney permits. In most cases the agent is treated as if he or she is the principal in any transactions which the agent is authorized to conduct.
A power of attorney can be general, so that the agent can conduct any sort of business on behalf of the principal, or it may be specific, limited to the transactions expressly provided for in the document.
Military Lawyers can offer help in preparing a Power of Attorney. Military legal assistance offices are located on almost every base, ship and installation. If you need legal assistance you can call or drop in to your local Legal Assistance office. Visit the Legal Assistance Office Locator to find the office nearest your location.