EXHIBIT 15 ACKNOWLEDGMENT LETTER To the Stockholders and Board of Directors NAC Re Corporation We are aware of the incorporation by reference in the Registration Statement (Form S-8 No. 333-00000) of NAC Re Corporation for the registration of the NAC Re Corp. 1997 Incentive and Capital Accumulation Plan of our reports dated April 22, 1997 and July 22, 1997 relating to the audited consolidated interim financial statements of NAC Re Corporation that are included in its Form 10-Q for the quarters ended March 31, 1997 and June 30, 1997. ERNST & YOUNG LLP New York, New York August 13, 1997