There are a number of subtypes of these field orders, based on knowledge patterns specific to individual military branches. Each subtype has its own acronym. Most are based on a METT-TC analysis (Mission, Enemy, Troops, Terrain, Time Available, and Civilian considerations). In addition, the Marines use the BAMCIS process (Begin the Planning, Arrange Recon, Make Recon, Complete Planning, Issue Order, Supervise) while the Army uses the eight Troop Leading Procedures (Receive the Mission, Issue a Warning Order, Make a Tentative Plan, Start Necessary Movement, Reconnoiter, Complete the Plan, Issue the Operations Order, Supervise) prior to potential enemy engagement.