The full form of HC is Head Constable, which can be equivalent to a Sergeant within the law enforcement forces of other nations. As a way to establish a head constable, you can location their three chevrons (pointed downwards) around the sleeves. A fellow aspirant can sit for UPSC assessment, https://whatisupsc62738.ambien-blog.com/23177849/a-review-of-upsc-full-form