A Professional Journal of National Defence College Volume 14 Number 2 December 2015 National Defence College Bangladesh EDITORIAL BOARD Chief Patron Lieutenant General Chowdhury Hasan Sarwardy, BB, SBP, ndc, psc Editor-in-Chief Air Vice Marshal Mahmud Hussain, OSP, ndc, psc, GD(P) Editor Colonel Md Mahbub-ul Alam, afwc, psc Associate Editors Colonel Muhammad Wasim-ul Haq, afwc, psc Lieutenant Colonel A N M Foyezur Rahman, psc, Engrs Assistant Editors Lecturer Khadijatul Kobra Civilian Staff Officer Md Nazrul Islam DISCLAIMER The analysis, opinions and conclusions expressed or implied in this Journal are those of the authors and do not necessarily represent the views of the NDC, Bangladesh Armed Forces or any other agencies of Bangladesh Government. Statement, fact or opinion appearing in NDC Journal are solely those of the authors and do not imply endorsement by the editors or publisher. INITIAL SUBMISSION Initial Submission of manuscripts and editorial correspondence should be sent to the National Defence College, Mirpur Cantonment, Dhaka-1216, Bangladesh. Tel: 88 02 9003087, Fax: 88 02 8034715, E mail :
[email protected]. Authors should consult the Notes for Contributions at the back of the Journal before submitting their final draft. The editors cannot accept responsibility for any damage to or loss of manuscripts. ISSN: 1683-8475 All rights reserved. No part of this publication may be reproduced, stored in retrieval system, or transmitted in any form, or by any means, electrical, photocopying, recording, or otherwise, without