Recruit training
Upon completion of their Officer recruit training, cadets will then progress to their trade specific training of varying length.
The British Army, Royal Navy, Royal Marines and Royal Air Force manage their own Phase One and Phase Two training establishments.

United States: In the United States, recruit training in the U.S. Army is called Basic Combat Training (BCT); U.S. Army Combat Arms MOS (11 Series, 19 series, 13 series, 12 series) and Military Police MOS (31 series) undergo One Station Unit Training (OSUT) which involves BCT, Advanced Individual Training (AIT) and Specialized Training (such as Bradley, or Mortar School, or Gunnery) all in one. In the U.S. Air and Space Forces it is called Basic Military Training (BMT). In the U.S. Navy, U.S. Marine Corps and U.S. Coast Guard it is called "Recruit Training" (commonly known as Boot Camp).
Some services present a badge or other award to denote completion of recruit training. The Army typically issues the Army Service Ribbon (issued after completion of Advanced Individual Training), and the Air Force presents the Air Force Training Ribbon and the Airman's Coin. The Marine Corps issue the Eagle, Globe, and Anchor once initial training is complete to signify that the recruits are now Marines. The Navy replaces the "RECRUIT" ball cap the recruits have worn throughout training with the "NAVY" ball cap upon successful completion of "Battle Stations". The United States Coast Guard's recruit training graduates place a Coast Guard Medallion on their ball cap.
For honor graduates of basic training, the Air Force, Coast Guard, and Navy present a Basic Training Honor Graduate Ribbon. The Navy and Marine Corps often meritoriously advance the top graduates of each division one pay-grade (up to a maximum of E-3).

U.S. Army: In the United States Army, recruits are sent to Basic Combat Training in a location designated according to the military Military Occupational Specialty, or MOS, which is selected upon enlistment.
Initial Entry Training (IET) is divided into two parts, which commonly take place at two different locations, depending on the chosen MOS:

Basic Combat Training, or BCT, is a ten-week training cycle. This period does not include "Reception Week" during which recruits are being slotted to their training companies (troops for cavalry). During reception, trainees get Sexual Harassment/Assault Response & Prevention training during IET, as of 30 July 2021.
Advanced Individual Training, or AIT, is where new soldiers receive specific training in their chosen MOS. The length of AIT training varies depending on the MOS and can last anywhere from four weeks to nearly one year.
Several MOSs (mainly combat arms) combine both basic training and AIT in a single combined course called One Station Unit Training (OSUT), which can last up to 22 weeks. The attitude and environment remain the same throughout the entire training cycle, including drill instructors.  Essentially, OSUT is an extended version of Basic Training, especially for Infantry OSUT, which remains on the same basic soldiering tasks for the entire cycle, although in greater detail. Infantry OSUT is conducted at the United States Army Infantry School at Fort Moore, and is 22 weeks long.
The U.S. Army has four sites for BCT:

Fort Moore at Columbus, Georgia
Fort Jackson at Columbia, South Carolina
Fort Leonard Wood at St. Robert, Missouri
Fort Sill at Lawton, Oklahoma
During Basic Combat Training, Army recruits learn a variety of basic combat skills including: Basic Rifle Marksmanship (BRM), land navigation, patrolling, securing and defending a position, drill and ceremony, fireteam formations and assaults, communications and use of AN/PRC-119 radio, combat lifesaving skills, 9-line medevac, reporting intelligence, hand grenades, Claymore mines, M203/M320 grenade launcher, M249 Squad Automatic Weapon (SAW), M240B machine gun, M2 .50 caliber machine gun, MK-19, and AT-4 anti-tank weapon. Training also includes combat conditioning by running an obstacle course, the Confidence Course, conducting marches of varying distances up to 12 miles, physical training, and Modern Army Combatives Program (MACP), a martial arts program based on the combination of Brazilian jiu-jitsu, wrestling, judo, Muay Thai, boxing, and a number of others. Recruits are trained to adopt the Army "Warrior Ethos", and to memorize and live by the Soldier's Creed.
BCT is divided into three phases. During Phase I, (also known as "Red Phase") recruits are subject to "Total Control," meaning their every action is monitored and constantly corrected by drill sergeants. The first week of training is commonly referred to as "Hell Week," due to the intense period of adjustment required on the part of the new recruits. Marches are common throughout basic training. Recruits are sent to the "gas chamber" during Phase I, as part of training for defensive chemical warfare. They are also introduced to their standard-issue weapon, the M16A2 rifle, the M16A4 rifle, or M4 carbine.
In Phase II (also known as "White Phase") soldiers begin actually firing weapons, starting with the rifle or carbine (M4A1). Other weapons the recruit becomes familiarized with include various grenades (such as the M67 fragmentation grenade) and grenade launchers (such as the M203). Recruits are then familiarized with the bayonet, anti-tank/armor weaponry and other heavy weapons. The course also includes an obstacle course which the soldiers are expected to negotiate in a certain amount of time. Additionally, Phase II includes continual, intense PT, along with drill and ceremony training. At the conclusion of Phase II, Soldiers are to demonstrate proficiency with the various weaponry with which they trained.
Phase III or "Blue Phase," is the culmination and the most challenging of all the training phases. A final PT test is administered during the first week. Recruits who fail are frequently retested, often up until the morning of their cycle's graduation. If they do not pass, then they are recycled to another platoon that is in an earlier phase of the training cycle until they meet the fitness standards. The final PT Test is the Army Physical Fitness Test (APFT). Usually, a soldier needs to score at least 60 points in each APFT category (pushups, planks, and 2 mile run) to pass, but in Basic Combat Training, only 50 points are required; the soldier will nevertheless take another APFT with a 60-point requirement at AIT. During Blue Phase, the recruits move on to such longer and more intensive "bivouac" and FTX (Field Training Exercises) as nighttime combat operations. Drill sergeants will make much of this an adversarial process by working against the recruits in many of the night operations and trying to foil plans, etc.
Upon completion of Basic Combat Training, a recruit is now a soldier, and has developed skills to operate in a combat environment, as a basic rifleman and to perform his or her MOS-specific duties under fire.

U.S. Marine Corps: The United States Marine Corps Recruit Depots are located at Marine Corps Recruit Depot Parris Island, South Carolina, and Marine Corps Recruit Depot San Diego, California. Men and women go to either, depending on whether they were recruited east or west of the Mississippi River. Until 2021, women only trained at Parris Island. Marine Corps boot camp is the longest basic training, excluding Army One Station Unit Training (OSUT), in-processing & out-processing is included unlike the other branches as the other branches do not contain this in their Basic Training duration length. Formerly, recruits were referred to as either "(the) private(s)" or "(the) recruit(s)" from day one of Recruit Training. Since the 1990s, they are referred to as "(the) recruit(s)" alone until they earn the title of Marine.
Marine Corps Recruit Training (MCRT) is a 13-week program that is divided up into three four-week phases and further broken down into individual training days. While there are 69 individual training days, recruits also go through pre- and post-training processing where recruits are afforded relatively little freedom. Phase one mainly consists of learning recruit life protocol, physical training, MCMAP training, academic classes, initial drill, a series inspection, and the confidence course. West coast recruits also do swim qualification during this phase. Phase two is completely in the field at Camp Pendleton for west coast recruits, with the first two weeks being spent on marksmanship training and qualification with the M16A4 service rifle, and the last week in the field learning skills such as fireteam formations, land navigation, and hikes. For east coast recruits, phase two is swim qualification, rifle qualification, and Team Week, a week of maintenance duties for the island as a show of how to perform base support tasks while still keeping military bearing and attention to detail. Phase three brings the San Diego recruits back to the recruit depot where they finish up with final drill, final inspection, more PT and confidence courses, and graduation. During third phase, west coast recruits also go back into the field one last time to do the Crucible event. Parris Island recruits finish with field training, final drill and inspection, the Crucible, and graduation. Note that recruits going to either depot receive exactly the same training, if in a different order.