In fieldcraft lessons cadets learn infantry skills such as patrolling, section battle drills, ambush drills, harbour drills, and how to survive in the field. Sharnbrook has its own training area for exercises, and also uses Barnham training area along with the rest of the county. Field exercises take place about once every few months, and at annual camp.

Out on exercise cadets wear DPM (disruptive pattern material) clothing, dulled boots, camouflage cream to eliminate the face's natural shine, a camo hat and foliage to break up the unnatural shape of the head and shoulders, webbing to carry rifle magazines and emergency rations, and a bergen to carry a sleeping bag and basha (improvised shelter) building materials. Cadets are issued with 24-hour ration packs and hexamine cookers as used by the infantry.

As part of a platoon cadets set up harbour areas (operations bases), post sentries, and send out patrols to carry out reconnaissance, lay ambushes, and assault enemy positions. Cadets become familiar with a vast range of hand signals for silent communication, and various patrol formations for crossing different types of terrain, such as the arrowhead formation (pictured right) for crossing open country. Patrols stay in touch with military radio sets, operated by cadets that have passed courses in signalling.