The FAQ explanation on military.ie is very poor so I'm gonna post this to explain the differences between all 3. Not just the training but also what comes afterwards, once you finish training and work in the job. It won't answer everything but hopefully it'll give a better idea of how the jobs differ.
General Service (Recruit - Private - NCO)
General Service enlistment is for those who want to serve primarily as soldiers, sailors or airmen/airwomen in frontline roles rather than as officers or specialist technicians. After recruit training, your job centres on core military skills: fieldcraft, weapons handling, duties, exercises, patrols, shipboard tasks or air corps ground roles, with further courses opening up paths like driver, gunner, seaman, security, or other non‑trade specialisations. Leadership responsibility can grow over time, but the focus is on being part of the team that actually executes missions on the ground, at sea or in the air. You can do a potential NCO Course (right out of training) to become a Corporal who are responsible for a section (a team of 9).
Officer Cadet (Cadet - Lieutenant)
An officer cadet is a leader in training whose job is to learn how to command, plan and make decisions for a team, platoon, ship’s department or flight, rather than to stay focused on one trade. Daily life after commissioning revolves around: leading troops on exercises and operations, running training, managing administration and welfare, and representing the Defence Forces in domestic and overseas roles. Training is longer and more academically demanding, with a heavy emphasis on tactics, leadership, decision‑making and professional military education so that on day one as a junior officer you are responsible for people, equipment and missions.
Once commissioned as a Lieutenant (college graduate) or 2nd Lieutenant (non graduate), an officer’s job is to lead people, plan activity and manage resources rather than focus on one specific technical task. Typical duties include running training for soldiers or sailors, leading platoons/exercises/battalions on exercises and operations, handling admin and welfare for their troops, and contributing to planning for everything from routine duties to overseas deployment. Officers also represent the Defence Forces in formal settings and are expected to keep up professional military education over their careers.
The job is less "tip of the spear" soldiering and more command and control/admin based. You won't be assault trenches or clearing rooms (that's not an officers job).
Apprentice / Technical Trainee
An apprentice or technical trainee signs up first and foremost to become a qualified tradesperson embedded in the military. The core of the job is maintaining, diagnosing and repairing Defence Forces equipment and systems so that units, ships or aircraft can actually operate, with structured technical training, civilian recognised qualifications and a clear trade progression path. Once qualified, an apprentice/technical trainee works as a tradesperson within their corps or service, responsible for keeping equipment and systems serviceable. That can mean inspection, fault‑finding and repair on vehicles, weapons, comms, aircraft or naval engineering systems, documenting work, and liaising with commanders to prioritise what must be fixed to keep units, ships or aircraft operational. You still soldier, sail or serve in uniform however, your main contribution is technical depth rather than command responsibility for a platoon or section.
Like officers, you are not working in a soldiering capacity. You are in combat service support. You're job is to support the boots on the ground. Teamwork makes the dreamwork!!!
Hope this clears up some confusion of the roles and gives you a better idea of the entry routes into the DF.
