The CBI has booked a colonel posted with the Army Ordnance Corps under the Eastern Command in Kolkata in an alleged Rs 50 lakh bribery case, officials said on Tuesday.The officer is accused of favouring a Kanpur-based company by allegedly manipulating the award of tenders, approving substandard samples, and facilitating clearance of pending and inflated bills.In its FIR, the Central Bureau of Investigation (CBI) said the colonel had contacted the industrialist over the pending bribe payment, to which the businessman cited cash constraints.The agency alleged that the officer later called the industrialist’s driver and asked him to deliver the payment to one of his acquaintances. The pending bribe amount of Rs 50 lakh was to be routed through hawala channels, it alleged.