noun
comrade
KOM-rad/ˈkɑːmræd/
A companion or fellow member of a group or cause.
The hiker helps a comrade carry supplies up the slope.

Etymology
The companion was originally someone who shared a room, with the underlying image of a chamber. Sharing quarters broadened into the close association of companions or fellow group members.
In context
they did their best to help the new soldiers in everything. One must take into account that scouts are a special cast. One has to be dead sure about one's comrade to accomplish a mission.
More examples
- The soldier refuses to leave a wounded comrade behind.
- His comrades in the union help organize the strike.
- After years of campaigning together, I consider her a trusted comrade.
Forms
comrade · comrades
comradeship noun — Friendship and trust among close companions.