Reserve recruits are first selected at an Army Assessment Centre, before progressing onto Phase One Basic Training.

They were originally commanded and administered by their local Regional Forces (RF) Brigade.

[4][10] During Mod 2, Army Training Units primarily teach recruits their Weapon Handling Test (WHT), live firing and Annual Combat Marksmanship Test (ACMT), practical map and compass navigation, battlefield casualty drills and casualty evacuation, further drill instruction as well as a night in the field conducting non-tactical fieldcraft training, mental resilience and physical training sessions; including TABs (Tactical Advance to Battle), also known as Loaded Marches.

[4][10] Following completion of Mod 2 comes the 15.5-day residential Module 3 'Battle Camp',[6] which is held primarily at ATR Grantham, in which recruits are trained and assessed according to the Common Military Syllabus (Reserve) and Mandatory Annual Training Tests (MATTs)[11] by Regular Army permanent staff.

[9][4] Recruits will then attend Phase Two Trade Training courses as stipulated by their cap badge / role,[12] and if joining the 4th Battalion, Parachute Regiment, or other Reserve Airborne Units such as 299 Para Sqn, attend Pre-Parachute Selection and pass P Company Test Week.