This chapter discusses the types of forces involved. Actually, there is a correlation between types of strategies and types of forces. The strategy selected governs the type of forces required for its execution. Accordingly, the two sets of problems, that dealing with strategic doctrines or programs and that dealing with the structure or composition of forces required, constitute one subject, with a difference in point of departure; the mode of employment or the means. The strategies require different weapons. For striking military bases, accurate, high-yield weapons are needed since enemy weapons will probably be hardened. For striking cities, less accurate weapons are sufficient, for a city is an 'area' target, and a relatively small yield is sufficient to inflict wide-spread death and destruction. Counterforce strategy is based on forces suitable for a first strike, for initiating a war. The distinction between the doctrines of strategic forces is parallel to Samuel P. Huntington's distinction between 'strategy' and 'structure'.