你们有美国国籍的到包括伟大祖国的美国境外旅游通过国务院的这个网址向美国驻前往国的大使馆注册登记么？

Travel registration is a free service provided by the U.S. Government to U.S. citizens who are traveling to, or living in, a foreign country. Registration allows you to record information about your upcoming trip abroad that the Department of State can use to assist you in case of an emergency. Americans residing abroad can also get routine information from the nearest U.S. embassy or consulate.

https://travelregistration.state.gov/ibrs/ui/

Travel registration is a free service provided by the U.S. Government to U.S. citizens who are traveling to, or living in, a foreign country. Registration allows you to record information about your upcoming trip abroad that the Department of State can use to assist you in case of an emergency. Americans residing abroad can also get routine information from the nearest U.S. embassy or consulate.