Answer:
You throw me out when you use me and take me in when you are done.
I have two body parts but am used to measure length. What am I?
What is harder to catch the faster you run?
What loses its head in the morning but gets it back at night?
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?