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«> "To: Washington @.. From: Washington ri Re: 279A-WF-222936, 05/20/2004 also mentioned that_if_ one could gain access to Room one could then enter Roon{ | During[ ___Jemployment at USAMRIID, there were 0-day windows of opportunity following aerosol challenges, eginnin During thé = period, there entered the hot suites. windows following each challenge in 1S time ion 0 ie itiona during these windows of opportunity must consider the use oF “piggybacking" | into the hot suites, which is known'to have occurred routinely at USAMRIID. "Piggybacking" allows entry of more than one person into an area while only one individual's identifier is recorded. Key card access records were also searched for am access into the hot side of ee for the post-challenge windows of opportunity. ac. id ter the hot suites in Building ames. entered the hot suites in Buildin ESS A record of 5 entrance key card access records was compiled, and individuals pie who entered or exited these locations shortly after were noted. The elapsed time between recorded entries or activity and other individuals' records ranges from 0 minutes to 81 minutes. It is important to note that key card records of access within USAMRIID were only available beginning August 1, 1998. This analysis does not include activity prior to that date. had