Jim,

How about this:

=MESSAGEBOX("THIS IS A DOD COMPUTER SYSTEM. BEFORE PROCESSING CLASSIFIED INFORMATION, CHECK THE SECURITY ACCREDITATION LEVEL OF THIS "+CHR(13) ;
+ "SYSTEM. DO NOT PROCESS, STORE, OR TRANSMIT INFORMATION CLASSIFIED ABOVE THE ACCREDIATATION LEVEL OF THIS SYSTEM. THIS "+CHR(13) ;
+ "COMPUTER SYSTEM, INCLUDING ALL RELATEED EQUIPMENT, NETWORKS, AND NETWORK DEVICES (INCLUDES INTERNET ACCESS) ARE PROVIDED "+CHR(13) ;
+ "ONLY FOR AUTHORIZED U. S. GOVERNMENT USE. DOD COMPUTER SYSTEMS MAY BE MOINTORED FOR ALL LAWFUL PURPOSES, INCLUDING TO "+CHR(13) ;
+ "ENSURE THEIR USE IS AUTHORIZED, FOR MANAGEMENT OF THE SYSTEM, TO FACILTATE PROTECTION AGAINST UNAUTHORIZED ACCESS," + CHR(13) ;
+ "AND TO VERIFY SECURITY PROCEDURES, SURVIVABILITY, AND OPERATIONAL SECURITY. MONITORING INCLUDES, BUT IS NOT LIMITED TO, ACTIVE" + CHR(13) ;
+ "ATTACKS BY AUTHORIZED DOD ENTITIES TO TEST OR VERIFY THE SECURITY OF THIS SYSTEM. DURING MOINTORING, INFORMATION MAY BE " +CHR(13) ;
+ "EXAMINED, RECORDED, COPIED AND USED FOR AUTHORIZED PURPOSES. ALL INFORMATION, INCLUDING PERSONAL INFORMATION, PLACED ON "+CHR(13) ;
+ "OR SENT OVER THIS SYSTEM MAY BE MONITORED. USE OF THIS DOD COMPUTER SYSTEM, AUTHORIZED OR UNAUTHORIZED, CONSTITUTES "+CHR(13) ;
+ "CONSENT TO MONITORING. UNAUTHORIZED USE OF THIS DOD COMPUTER SYSTEM MAY SUBJECT YOU TO CRIMINAL PROSECUTION. EVIDENCE OF "+CHR(13) ;
+ "UNAUTHORIZED USE COLLECTED DURING MONITORING MAY BE USED FOR ADMINISTRATIVE, CRIMINAL, OR OTHER ADVERSE ACTION. USE OF "+ CHR(13) ;
+ "THIS SYSTEM CONSTITUTES CONSENT TO MONITORING FOR ALL LAWFUL PURPOSES.",0+48)