What are the most secretive military jobs?

I'm curious about the more hidden roles in the military. What are the most secretive positions, and what do they usually entail? Also, how competitive is it to land one of these jobs?

Certain military job roles are renowned for their secretive nature due to the sensitive and classified information they involve. Here are a few examples:

1. Special Forces Operatives: Perhaps the most well-known secretive jobs in the military are those in Special Forces, such as the Navy SEALs or Army Rangers. Membership in these elite groups involves rigorous physical and mental training, as well as executing high-risk, covert operations.

2. Cryptologic Linguist: These individuals are trained in foreign languages and cryptology, the study of codes. They are responsible for deciphering, translating, and analyzing foreign intelligence. Their work involves extracting and conveying valuable information from non-English sources.

3. Intelligence Officers: These personnel are responsible for collecting, analyzing, and interpreting intelligence data to assist in decision-making processes. This role can involve human intelligence (HUMINT) or signals intelligence (SIGINT) collection.

4. Counterintelligence Agents: These specialists identify, assess, and counteract threats from foreign intelligence entities. Their work is often highly secretive, involving surveillance, investigation, and in some cases, undercover activities.

In terms of competition, these roles are typically quite challenging and competitive to land. They demand high physical fitness, mental grit, a dedication to secrecy, and often require top security clearances. Applicants are typically subjected to various assessments and a thorough background investigation.

While these roles are often glamorized in popular media, it's important to remember that they can involve a great deal of risk and stress. Yet, they offer unique opportunities for service, and foster a deep sense of camaraderie among those involved.