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Although I think that it's perfectly possible to say "vehicle pool", "fleet" got far more relevant hits with army, so that's what I've used. Thanks very much everyone. 4 KudoZ points were awarded for this answer
Explanation: Nikki, Federico Beigbeder Atienza's Diccionario Politécnico de las Lenguas Española e Inglesa offers "motor pool" and "vehicular pool"
Google hits for "vehicle pool" + "army" = 141.
(Pity I missed the powwow in Sant Sadurnì. :-( )