Future naval and air forces will be comprised increasingly of unmanned and autonomous systems. Nearly 100 nations and nonstate actors currently operate unmanned and autonomous systems to support combat operations. These platforms have proven their ability to enhance situational awareness and improve mission performance. Unmanned systems will be used to augment manned platforms and will conduct missions that are considered dull, dirty and dangerous, thereby reducing risk to human life at a reduced cost. Introduction of these systems and vehicles will require states to modify how they characterize these platforms under international law as ships, warships, commercial aircraft and state aircraft to ensure that they are able to legally perform the missions that they have been designed to perform. This will require filling gaps in domestic and international law and regulations to better regulate and control the employment of these systems in the marine environment to ensure safety of navigation and overflight and protection of the marine environment.

Advances in long-range precision strike missiles, such as cruise missiles, ballistic missiles and hypersonic weapons, threaten the survivability of surface warships. In response, states are deploying submarines in the water column and expanding military activities on the seabed. Concepts such as “upward falling payloads” and networked “hydra” seabed installations envision prepositioned sensors and weapons emplaced on the continental shelf along an adversary’s coast. This chapter explores the legality of military operations on the continental shelf of a coastal state. The coastal state has sovereign rights and jurisdiction over the living and nonliving resources of the seabed and subsoil in accordance with the UN Convention on the Law of the Sea. Foreign military activities are generally permissible on the continental shelf of a coastal state so long as they observe due regard for the resource rights of the coastal state. Coastal states enjoy the exclusive right to construct artificial islands on their continental shelf but they lack competence to regulate military seabed installations and structures on the continental shelf.

Section E seeks to show how the law on the conduct of hostilities that would apply in relation to the use of conventional weapons also applies in respect of nuclear weapon operations. The Rules and Commentaries deal with persons participating in the hostilities, who are distinguished from protected civilians, and with specific issues of naval and air warfare. The Rules and Commentaries on nuclear targeting address the notion of ‘attack’, the principle of distinction, prohibited nuclear attacks, the definition of military objectives, proportionality and active and passive precautions. As to methods of nuclear warfare, the Section addresses perfidy and ruses, the improper use of protective indicators and emblems, as well as the concept of zones. The Section further includes Rules and Commentaries on persons and objects entitled to specific protection and on the protection of the natural environment in times of armed conflict.

Taking its lead from a famous scene in 2 Henry IV and drawing upon the latest historical scholarship, this chapter surveys the modernization of England’s military capacity during the reign of Elizabeth I. By contrast with the success of England’s naval revival, the parallel effort to overhaul the antiquated county militia system and to create armies for service abroad achieved only partial success. While bows and bills were gradually replaced by guns and pikes and a proportion of each county’s militia was formed into “trained bands,” the sheer scale of the effort meant that the modernization of England’s military capacity on land always remained a frustratingly incomplete endeavor. Even so, Elizabeth’s privy council and the lord lieutenants of the counties made greater progress in this effort than has typically been recognized and managed to sustain war on multiple fronts over a period of more than twenty years.