Arms
Armament, Armed
noun, verbal noun, の adjective
The most important part of your military attire are your arms (not the ones attached to your body, your guns and stuff). Arms are what make you a real military person.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
どうやら、武装勢力に襲われたようだ。
It seems that they were attacked by armed insurgents.