New Delhi: The CBI has booked the principal of the National Defence Academy (NDA) at Khadakwasla in Pune, four faculty members and some unidentified persons for alleged irregularities in the appointment of teaching staff at the institute for training military officers. A case was registered under Sections 12-B, 420, 465 and 471 of the IPC and Sections 13(2) and 13(1)(d) of the Prevention of Corruption Act against the accused. Those booked are Principal Om Prakash Shukla, a political science professor,  an assistant professor of chemistry, an assistant professor of mathematics and head of the department of chemistry.There were complaints that academic performance indicator (API) scores of applicants were approved in violation of rules and sent to UPSC. Later, these persons were appointed as professors and associate professors by UPSC.Some officials from the defence ministry have also been named in FIR. — TNS