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nw “" 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 Roonf | buring| __Jemployment at USAMRIID, there were ee windows of opportunity following aerosol challenges, eginnin During the ~da S period, there entered the hot suites. enclosure) window Ollowiling ac Challenge in Ls ime I 10n 0 of additional key card access records co fauring 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 an access into the hot side of Buildin and for the post-challenge windows of opportunity. id ter the hot suites in Building imes. entered the hot suites in Buildin ese A record ofL__ matin entrance key card access records was compiled, and individuals who entered or exited these locations shortly before or 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. +4