U.S Army My job in the army will be a b21 and is Skill Level 1 MOSC 21B1O. Performs basic combat construction. Operates various light or heavy engineer wheeled vehicles. Operates or serves as crewmember on a CEV, AVLB, or an ACE while parti ting in combat mobility, countermobility, and survivability operations. Prepares and installs priming and firing systems for demolition and explosives. Arms, disarms, and installs antipersonnel and antitank mines. Locates mines by visual means or by using a mine detector. Recognizes and neutralizes y traps, friendly and threat mines, and firing devices. Skill Level 2 MOSC 21B2O. Performs duties in preceding skill level, supervises lower grade soldiers and provides technical guidance to the soldiers in the accomplishment of their duties. Directs and as*ists in the operation of engineer wheeled or tracked vehicles. Supervises and/or operates the ACE. Directs and as*ists in launching and retrieval of an AVLB. Boresights, determines zero settings, and fires the CEV weapon systems. as*ists in performance of organizational maintenance of vehicle and armament system components. Directs the construction of fighting positions and wire entanglements. Controls fire team movements. Places explosives and clears misfires. Directs a mine-clearing line charge loading team. Directs minefield marking party and dispensing operation of mine scattering systems. Conductsreconnaissance operations, determines limiting slopes, curves, stream velocity, and gap widths. Skill Level 3 MOSC 21B3O. Performs duties in preceding skill level, supervises lower grade soldiers and provides technical guidance to the soldiers in the accomplishment of their duties. Tasks, supervises, and instructs squad and section personnel. Directs utilization and maintenance of vehicles and equipment. Supervises and directs employment of a CEV and its crew. Prepares the CEV for firing. Supervises range card preparation for CEV. Provides unit and job site security. Prepares and issues an oral squad operation order. Conducts the maneuver of a squad in a patrol. Directs minefield installation, removal, and submits minefield reports. Conducts breaching operations. Collects data and calculates the requirement for explosives and related material. Directs construction of combat bunkers, shelters, and nonexplosive anti-vehicular obstacles and expedient lifing devices. Conducts ground reconnaissance for roads, routes, bridges, tunnels, fords, and ferries. Prepares a demolition and engineer reconnaissance report. Directs as*embly of various military bridges. Skill Level 4 MOSC 21B4O. Performs duties in preceding skill level, supervises lower grade soldiers and provides technical guidance to the soldiers in the accomplishment of their duties. assigns tasks to subordinate elements and personnel. Accounts for soldiers, material, and equipment. Supervises in mine warfare, demolitions and combat construction operations. Enforces safety standards, field sanitation, c