Neurotransmitters are chemical messengers that coordinate the transmission of signals from one nerve cell (neuron) to the next.eurotransmitters are chemical messengers that coordinate the transmission of signals from one nerve cell (neuron) to the next.
Soldiers in the secondary zone may be boarded with 16 months time-in-service and four months time-in-grade as of the first day of the board month. The time-in-service requirement for attaining eligibility for promotion to SSG is 84 months Active Federal Service for the primary zone and 48 months for the secondary zone.
There are two promotion processes known as Primary Zone and Secondary Zone.. Most enlisted are promoted in the Primary Zone.. The Secondary Zone gives an opportunity for commanders to give exceptional performers an early shot at promotion.