The start of WW2, September 1, 1939, saw the US Army as the 17th largest military manpower in the world morph into the world’s second largest army. The US began WW2 as a Navy titan and ended the war with an Army and Air Force almost on par with the Navy. The men entering the US military branches all went through boot camp, discussed below.

Table of Contents
Boot Camp
History
Boot camp has its origins in US military recruit training as soldiers were expected to possess strong endurance and be in good physical shape. The term “boot camp” specifically originated during the Spanish-American War when American military recruits wore leggings known as “boots.” As a result, their training camps became known as “boot camps.” The word ‘boot’ has evolved into military slang for a recruit still in boot camp.
The camps have a history dating back to the Spanish-American War in 1898, when training camps were established for new recruits. The camps focused on providing intensive physical and mental training to prepare soldiers for combat. Throughout World War I and World War II, boot camps emphasized physical fitness and discipline, with the goal of building a sense of teamwork and camaraderie among soldiers.
Differences Between Branches
US military boot camps were similar in many ways across the different branches, but there were also notable differences. The length varied between the different branches, but typically lasted several weeks to a few months, and each branch placed a different emphasis on certain skills or competencies. The training environment could differ between the branches, as could the culture and traditions, which influenced the nature of camp. Each branch had its own unique specializations and career paths, and while boot camp provided some basic training in these areas, further specialized training was often required afterwards.
The unique cultures and traditions of the different US military branches have had a significant influence on the nature of their respective camps. The Marine Corps, for example, has a strong emphasis on physical fitness, and this is reflected with a rigorous training program that includes running, obstacle courses, and martial arts training. The Army, on the other hand, emphasizes discipline and obedience, with a strict hierarchical structure and focus on following orders.
The Air Force may place a greater emphasis on technical skills, such as aircraft maintenance and operation, and the Navy may emphasize teamwork and camaraderie, with an emphasis on shipboard operations and working together as a team. The Coast Guard’s boot camp may emphasize specialized skills such as search and rescue, maritime law enforcement, and navigation.
While all boot camps share some common features, such as physical fitness training and discipline, the specific focus of each branch’s boot camp reflects its unique mission and identity. By emphasizing different skills and competencies, each branch can prepare its recruits for the unique challenges and demands of their respective roles in the military.
Duration
At the beginning of World War II, the duration of US military boot camp varied by branch. Here is a breakdown of the approximate length of boot camp for each branch:
- Army: 13 weeks
- Navy: 7-9 weeks
- Marine Corps: 8 weeks
- Coast Guard: 6 weeks
- Army Air Corps (later renamed the Air Force): 6 weeks
As the war progressed and the need for trained soldiers increased, the duration of boot camp was shortened in some branches in order to accelerate the training process. Here is a breakdown of the approximate length of boot camp for each branch later in the war:
- Army: 8-12 weeks
- Navy: 7-8 weeks
- Marine Corps: 8 weeks
- Coast Guard: 6 weeks
- Army Air Corps (later renamed the Air Force): 8 weeks
It’s worth noting that these durations are approximate and may have varied depending on the specific training program and needs of the military at that time.
Typical Daily Schedule
The daily schedule for a soldier in boot camp can vary depending on the branch of the military and the specific training program, but here is a general outline of what a typical day might look like:
5:00 AM – Wake up and personal hygiene
5:30 AM – Physical training, such as running or calisthenics
6:30 AM – Breakfast
7:30 AM – Classroom instruction, such as weapons training or military tactics
11:30 AM – Lunch
12:30 PM – More classroom instruction or hands-on training, such as obstacle courses or marksmanship training
5:00 PM – Dinner
6:00 PM – Personal time for hygiene, letter writing, or relaxation
9:00 PM – Lights out
It’s worth noting that the daily schedule for boot camp can be rigorous and demanding, with little free time or personal space. The goal is to instill discipline, teamwork, and resilience in soldiers, while also providing them with the skills and knowledge they need to succeed in their military roles.
Challenging Aspects
Boot camp is a challenging and rigorous experience that pushes soldiers to their physical and mental limits. The intense physical training can be exhausting, and soldiers may be required to run long distances, complete obstacle courses, or engage in other physically demanding activities. Boot camp is also designed to challenge soldiers’ mental toughness and resilience, often subjecting them to stress and sleep deprivation to prepare them for the rigors of military life. Additionally, the strict rules and regulations that soldiers must follow can be challenging for some, who may be used to more freedom and autonomy in their daily lives.
In addition to the physical and mental challenges, boot camp places a strong emphasis on teamwork and camaraderie. Soldiers may be required to work closely with others, sometimes in high-pressure situations, in order to complete tasks and achieve goals. This requires a high level of discipline and a willingness to put the needs of the team above one’s individual interests. Finally, boot camp involves a significant adjustment to a new environment and way of life, requiring soldiers to adapt to new routines, expectations, and living conditions. While it can be difficult, many soldiers find that the experience helps them develop new skills, strengths, and resilience that serve them well throughout their military careers.
US Military Manpower 1939 – 1945 Data
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Source: The National WWII Museum, “Research Starters: US Military by the Numbers”, https://www.nationalww2museum.org/students-teachers/student-resources/research-starters/research-starters-us-military-numbers, Date accessed June 26, 2022
Other Manpower Data Links
Comparative Military Manpower Sept 1939
Military Manpower by Nation 1940 to 1945
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