The Jack Tars & Leathernecks Collection features both Marines and Naval personnel from many countries of the world. At the dawn of naval warfare, there was a little distinction between sailors and soldiers on any particular warship. The Romans were the first to understand the importance of trained soldiers dedicated to melee combat on the high seas. By the 18th century, most of the great powers had a significant presence on the bounding main. Marines, also known as naval infantry, are typically an infantry force that specialises in the support of naval and army operations at sea and on land. An American Marine is often called a "Leatherneck", a moniker that comes from the protective leather neckbands worn to shield the wearer from sword or stave. During the 18th and 19th centuries, Seamen of the Royal Navy were known by the common English term "Jack Tars". It is thought to have derived from the prominent use of tar on board wooden vessels to protect hemp rope and rigging, and the waterproofing of fabrics.