I disagree.  This is a fairly poorly-written persuasive letter, and we have ample evidence for its lack of persuasive powers.  The letter opens with useless content &quot;This letter is written ...&quot; which is self-evident.  Then it proceeds to the grammatical error of &quot;insure&quot; which almost made me stop reading.  If I was writing a letter like this, and I wanted it to have some effect, this would be the first sentence:<p>The total loss of a future shuttle mission and the death of its crew is a near certainty with our current booster o-ring design.<p>Then I would omit everything else in the original letter except the request for staffing.