All of the military personnel have colds and stuffy noses.
The door was locked from the outside so that the military personnel wouldn't run away.
As a result of the Tofugu army reform, Koichi had to reduce the amount of military strength they had.
A soldier member (or a member of the soldiers) is a person that is of the military personnel. It also shows the amount of military strength an army has. The more soldier members, the more military strength and military personnel it has!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.