The EDIPI is a ten-digit number located in the barcode on the back of the card and in the integrated circuit chip embedded in the card itself. The first 9 digits are assigned unique numbers with the 10th digit being a check digit for the identifier. The EDIPI can be used as a unique person identifier.
In a British infantry battalion there are 3 rifle companies, 1 support company, 1 HQ company. Each rifle company is split into 3 platoons, and a HQ element. Each platoon is then split into 3 Sections of 8 men. Thee platoon is led by the platoon commander which is normally a 2nd lieutenant or lieutenant and a platoon sergeant.
1 4 Marines to a Fire Team (4) 2  3 Fire Teams to a Squad (12) 3  4 Squads to a Platoon (48) 4  3 Line Platoons and 1 Weapons Platoon to a Company (192) 5  5 Companies to a Battalion (960)  5 Battalions to a Regiment (4800)