advance officer (A)
An officer designated by the commander to precede the column by a
distance sufficient to reconnoiter the route of march and to select
alternate routes or detours if required; to instruct and place guides
and route markers, where appropriate; to notify authorities of approach
of column and receive instructions or changes to instructions
at highway regulation points. This officer may also command the
advance party.

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figura de Curt Nimuendajú, por sua vez comandante da tropa avançada daquele sertanista, de levar a cabo essa empresa ou “missão” de ...
www.ceferreiradecastro.org/capas/publicacoes/castriana3.pdf - Portugal