it sounds like there is no such a rank as "ameen shorta", beside other Egyptian innovations like "al-amn al-markazi", and in the absence of any serious efforts by the Arab translators for terminology exchange, all we have to do is naturalizing, if innovation is a concession of the Egyptian government!, one of the current words used on various web-pages, in terms of English versions. here is one. i wonder what delimma we're going to face before معاون مباحث or شاويش etc, hence i suggest transliteration just like we do with: sultan, darvish, harim, behind which is a private cultural background.

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Note added at 2003-10-08 13:28:24 (GMT) Post-grading
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I know this comment is belated for the asker, but the more we update the more we inrich Kudos glossaries. I still think transliteration is necessary and basic for terms that are mutually-inextricable with its cultural backround. Yet it\'d be helpful to give the language native speaker something similar in this language. Here, we can say for example: ...amin shorta (sort of police guard).