National governments deal in both intelligence and military special operations functions that either should be completely secret (i.e., clandestine: the existence of which is not known outside the relevant government circles), or simply cannot be linked to the sponsor (i.e., covert: it is known that sabotage is taking place, but its sponsor is unknown). It is a continuing and unsolved question for governments whether clandestine intelligence collection and covert action should be under the same agency. The arguments for doing so include having centralized functions for monitoring covert action and clandestine HUMINT and making sure they do not conflict, as well as avoiding duplication in common services such as cover identity support, counterespionage, and secret communications. The arguments against doing so suggest that the management of the two activities takes a quite different mindset and skills, in part because clandestine collection almost always is on a slower timeline than covert action.

Historical background During the Second World War, the United States Office of Strategic Services (OSS; the predecessor to the Central Intelligence Agency and to part of United States Army Special Forces) worked closely with the British Secret Intelligence Service (SIS), Special Operations Executive (SOE), and Political Warfare Executive (PWE). The latter two organizations were wartime, and their functions were merged back into SIS after the war.

The U.S. has generally followed the British model of a single civilian agency with close cooperation with military intelligence and military special operations forces. Many countries follow this model, but there are often calls to reorganize it, splitting off various functions into independent agencies. Historically, since the British clandestine intelligence, in recognizable form, goes back to the First World War, and their Second World War covert operations organization preceded U.S. entry into the war, it makes sense to present them first. There has always been a close relationship between the U.K. and U.S. organizations.

United Kingdom prewar operations Prior to World War II, the British covert action function was in Section D of the Secret Intelligence Service (SIS). SIS also had the clandestine HUMINT responsibilities. Indeed, the United Kingdom had a recognizable HUMINT function, less formal than the 20th century versions, going back to Sir Francis Walsingham in 1583.

United States background The American system tends to require more legal formalism than the British, so it became necessary to define "covert action". As a practical definition, covert action is something of which the target is aware, but either does not know, or cannot prove, who is influencing political, military, scientific, or economic factors in the target country. Plausible deniability is another way to say that the sponsor cannot be proven. Clandestine actions, in contrast, are actions of which the target remains unaware, such as espionage.

In the years immediately preceding the Second World War, the U.S. had no standing clandestine HUMINT or covert action organizations. There were certainly examples of both, such as Marine Major Earl Ellis' series of visits, in the 1920s, to Japanese islands in the Pacific. Ellis, who died under mysterious circumstances while on duty, created the basic plan for U.S. "island hopping" operations in the Pacific Theater of the Second World War.

Used wisely, a covert action, also called "special activities" in the military budget, can deliver a stronger message than diplomacy, while avoiding full-scale war. This was the original concept of George Kennan, which followed the Second World War and became the basic policy of the U.S. in 1947: "Political warfare is the logical application of Clausewitz's doctrine in time of peace. In broadest definition, political warfare is the employment of all the means at a nation's command, short of war, to achieve its national objectives. Such operations are both overt and covert. They range from such overt actions as political alliances, economic measures ..., and "white" propaganda to such covert operations as clandestine support of "friendly" foreign elements, "black" psychological warfare and even encouragement of underground resistance in hostile states. "Understanding the concept of political warfare, we should also recognize that there are two major types of political warfare--one overt and the other covert. Both, from their basic nature, should be directed and coordinated by the Department of State. Overt operations are, of course, the traditional policy activities of any foreign office enjoying positive leadership, whether or not they are recognized as political warfare. Covert operations are traditional in many European chancelleries but are relatively unfamiliar to this Government. "Having assumed greater international responsibilities than ever before in our history and having been engaged by the full might of the Kremlin's political warfare, we cannot afford to leave unmobilized our resources for covert political warfare. We cannot afford in the future, in perhaps more serious political crises, to scramble into impromptu covert operations...

The principle of Kennan's proposal was regarded favorably by all of the agencies discussing it, but none wanted control due to the potential embarrassment of having an operation compromised. As the junior agency, CIA lost the bureaucratic fight, and received, In 1948 National Security Council Directive 10/2 formed, from some interim organizations, the Office of Policy Coordination, responsible for covert operations. The Office of Special Operations had been autonomously doing clandestine intelligence gathering, and, in 1952, Director of Central Intelligence Walter Bedell Smith joined the two to form the euphemistically named Directorate of Plans.

In the US more than in other countries, there is a continuing battle between military and intelligence organizations, with different oversight procedures, about who should control covert action. Far from being avoided as it was in 1948, organizations actively want authority over it.

Both among intelligence and special operations organizations, there are a variety of views of whether covert and clandestine activities should be in the same organization. Those that argue for complete separation tend to be from the clandestine side, and distrustful of the ability of covert action organizations to maintain the appropriate level of secrecy. On the other hand, there have been cases where covert and clandestine organizations, unaware of one another, approach the same target in different ways, with both failing due to interference. As an example, OSS attempted to steal or copy a codebook from the World War II Japanese embassy in Lisbon, Portugal. Their actions were discovered, and the Japanese changed the code. Unfortunately, the clandestine communications intelligence organization had broken the code and were routinely reading traffic in it. The OSS action required them to start all over again in cryptanalyzing the new system.

There is no consensus on whether it is, or is not, advisable to intermingle espionage and covert action organizations, even at the headquarters level. There is much more argument for doing so at headquarters, possibly not as one unit but with regular consultation. Certain services, such as name checks, communications, cover identities, and technical support may reasonably be combined, although the requirements of a particular field network should be held on a need-to-know basis.

If the OSS operatives in Lisbon had asked permission for their proposed operation against the Japanese, their operation would not have been approved. They might have guessed the reason, but would not have known. On the other hand, if headquarters approval is necessary for every action, some fleeting opportunities may be missed. Further, if the communications used to contact headquarters are compromised, the enemy could learn about all upcoming operations.

Surging additional capability for the Second World War During World War II, the Union of Soviet Socialist Republics, the United Kingdom, and the United States all formed ad hoc organizations for unconventional warfare (UW), psychological operations and direct action (DA) functions. Other countries, such as occupied France, formed related units under their governments in exile.

There was close cooperation between the US and UK special operations, counterintelligence, and deception organizations. Cooperation was less tight between the more sensitive clandestine intelligence gatherers.

None of these new organizations continued to function, in the same form, after World War II ended. Many of their personnel, techniques, and operations continued, but in reorganized form during official peace, and very real Cold War.

United Kingdom World War II Operations The Ministry of Economic Warfare was a wartime operation responsible for UW/DA, economic warfare, and psychological operations. It contained the Special Operations Executive (SOE) and Political Warfare Executive. While Section D of SIS became the nucleus of SOE, in World War II, the British separated the unconventional warfare from SIS, putting it into SOE . It has been the conventional wisdom that this is the basic British doctrine, but, as with so many things in the clandestine and covert worlds, it is not that straightforward .

SOE conducted competent training in parachuting, sabotage, irregular warfare, etc. It could check language and marksmanship skills, as well as examining clothing and personal effects for anything that could reveal British manufacture, SOE trained agents in the distinguishing uniforms, insignia, and decorations of the Germans, "But it could not teach them the organization, modus operandi, and psychology of the German intelligence and security services; and it did not call upon the MI-5 and MI-6 experts who did know the subject..." those services also were reluctant to provide SOE with access to their own sensitive sources. While isolating SOE from the clandestine services provided some mutual passive security, it also failed to provide proactive counterintelligence.

"The consequences of this shortcoming are evident in the German counterintelligence coups in France, Belgium, and Holland...While the Security Service maintained an extensive name index, the Registry (partially destroyed by German bombing, but otherwise irreplaceable), SOE apparently did not maintain a counterintelligence index against which prospective field recruits could be checked. SOE received help from the British police, but not the security experts.

"At the end of the war the Foreign Office and the Chiefs of Staff agreed to return the responsibility for covert operations to the jurisdiction of the Secret Intelligence Service. There were three reasons for the change: to ensure that secret intelligence and special operations were the responsibility of a single organization under a single authority; to prevent duplication, wasted effort, crossing of operational wires, friction, and consequent insecurity; and to tailor the size of the covert action staff to the greatly reduced scale of peacetime needs. The peacetime condition also added a new factor which greatly increased the importance of consolidation.

Before World War II, paramilitary and covert action capabilities were the responsibility of the variously named Organs of State Security.

United States World War II operations Prior to World War II, the US had no standing paramilitary or espionage services. Missions were taken on a case-by-case basis, such as Major Earl Hancock Ellis' survey of potential Japanese bases in Micronesia .