The US Army lied to the pilots of the Apache relative to its’ invulnerability to the ZSU 23-4 weapons system.
These are the type of inflammatory comments that should always be supported by factual information. The US Army is an organization. An organization does not lie. People within the organization lie. Who in the US Army lied Lu? Please show me in writing where anyone has claimed that the Apache is "invulnerable" to the ZSU 23-4 weapons system?
Should you choose to believe everything CNN or 60 minutes claims, that is certainly your right. To use that information as the basis of an opinion regarding the overall ballistic tolerance capability of an aircraft, without detailed knowledge of the incident or supporting evidence is something I do not expect from an educated gentleman with your knowledge and engineering background.