The Selective Service System is a means by which the United States government maintains information on those potentially subject to military conscription. Most male U.S. citizens and male immigrant non-citizens between the ages of 18 and 25 are required by law to have registered within 30 days of their 18th birthday, and must notify Selective Service within ten days of any changes to any of the information he provided on his registration card, like a change of address. As of the end of 2008, the names and addresses of over 14 million men are on file.

Registration for Selective Service is also required for various federal programs and benefits, including student loans, job training, federal employment, and naturalization.

The Selective Service System provides the names of all registrants to the Joint Advertising Marketing Research & Studies (JAMRS) program for inclusion in the JAMRS Consolidated Recruitment Database. The names are distributed to the Services for recruiting purposes on a quarterly basis.

A service system (or customer service system, CSS) is a configuration of technology and organizational networks designed to deliver services that satisfy the needs, wants, or aspirations of customers.

"Service system" is a term very frequently used in the service management, service operations, services marketing, service engineering, and service design literature. While the term frequently appears, it is rarely defined.

One recent definition of a service system is a value coproduction configuration of people, technology, internal and external service systems connected via value propositions, and shared information (language, laws, measures, etc.). The smallest service system is a single person and the largest service system is the world economy. The external service system of the global economy is considered to be ecosystem services. Service systems can be characterized by the value that results from interaction between service systems, whether the interactions are between people, businesses, or nations. Most service system interactions aspire to be win-win, non-coercive, and non-intrusive. However, some service systems may perform coercive service activities. For example, agents of the state may use coercion in accordance with laws of the land.

Lawrence Romo is an American senior civil servant and former United States Air Force Officer. He is the current director of the Selective Service System.

Romo grew up in San Antonio and earned his Bachelor of Science degree from the United States Air Force Academy and a Master of Education degree from Montana State University – Northern (formerly Northern Montana College).

Romo served in various assignments for the United States Air Force (USAF) both on active duty and in the reserve. He served as a United States Air Force Academy Admissions Advisor, in various positions supporting the operation of the Minuteman Missile Weapon and Launch System, in Training Operations, and as an Air Transportation Officer. Upon retiring from the U.S. Air Force Reserve as a Lieutenant Colonel, Mr. Romo was the USAF Academy Liaison Officer Director for South Texas. He joined the United States Civil Service Commission in 1987, serving from 1987 until 1992 as an Item Manager for the Directorate of Special Weapons, and from 1992 through 1999, as the Transition Assistance Program Specialist at Kelly Air Force Base. He also served as the Chairman of Bexar County Veterans Committee and a member of the American Legion, American GI Forum, Association of United States Army, and the Military Officers Association of America. He served as Chairman of the San Antonio Commission for Children and Families for the City of San Antonio, Texas.

World War I (WWI), which was predominantly called the World War or the Great War from its occurrence until 1939 (World War II), and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918. It involved all the world's great powers, which were assembled in two opposing alliances: the Allies (based on the Triple Entente of the United Kingdom, France and Russia) and the Central Powers (originally centred around the Triple Alliance of Germany, Austria-Hungary and Italy; but, as Austria–Hungary had taken the offensive against the agreement, Italy did not enter into the war). These alliances both reorganised (Italy fought for the Allies), and expanded as more nations entered the war. Ultimately more than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history. More than 9 million combatants were killed, largely because of enormous increases in lethality of weapons, thanks to new technology, without corresponding improvements in protection or mobility. It was the sixth-deadliest conflict in world history, subsequently paving the way for various political changes such as revolutions in the nations involved.