Final answer:
When traveling with more than $10,000, you must report it to the U.S. Customs and Border Protection by filing Form FinCEN 105. This regulation is in place to monitor large sums of money crossing borders to prevent illegal activities.
Step-by-step explanation:
When traveling with an excess of $10,000 in or out of the United States, it is a legal requirement to notify the U.S. Customs and Border Protection (CBP). This regulation is enforced to prevent money laundering and other illegal activities. The funds can be in the form of cash, checks, money orders, or any other monetary instruments. The notification does not necessarily involve installation commanders or security police, although they may have their own protocols if this relates to a military installation. For civilian travel, a 'Report of International Transportation of Currency or Monetary Instruments' Form FinCEN 105 must be filed. Failure to report the transportation of currency over $10,000 can result in its confiscation and potential legal penalties.