Intentional or not, veterans do quite often recollect things wrongly or inaccurately comparable to what evidence suggests.
Remember, you're asking someone who's been through an awful lot to recall very minor details that happened a long time ago. Memories tend to deteriorate over time.
Having spoken to several veterans before this almost always seems to be the case. It's not clear as day. Sometimes the details are lost because they just didn't know what they were fighting, or where. In most situations they will assume the worst... If you ask them if they were fighting something that has a drummed-up reputation like the Tiger, they will more often than not say yes. The History Channel should take some responsibility for this, but if they ask a veteran questions they are often obliged to tell the story of their experiences.
Am I calling veterans liars? Certainly not. But details do get lost in translation.