N.R. Jenzen-Jones Update 21 April 2018: Information released today by US Air Forces Central Command (AFCENT) indicates that standard JASSM cruise missiles were used in the strikes, not the JASSM-ER as previously reported by the Pentagon. A spokesman also noted that F-22 Raptors took part in the operation, presumably flying counter-air. A good summary has been posted at The Aviationist.