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.
Since at least 1986, a Tank Platoon is four tanks. The next unit up in size for tanks is either the Company or Troop (depending on whether they are in an armored unit, or a cavalry unit). A Tank Company has three platoons of four tanks each, with two additional tanks in the HQ platoon, for a total of 14 tanks.