Read "ATP 3-21.8 Infantry Platoon and Squad, April 2016" by United States Army online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
Most joint publications are available online at: http://www.dtic.mil/doctrine/doctrine/doctrine.htm.
JP 1-04, Legal Support to Military Operations, 17 August 2011. JP 2-0, Joint Intelligence, 22 October 2013.