Military decoy specialist Chemring reported a strong order book and said the outlook for 2010 remains in line with expectations.The order book stands at £559m, a rise of 37% since October last year.It said the acquisition of Niitek, a detection systems group, has 'proved particularly successful' with more than 44 of its mine detection systems sold in the year. The countermeasures division has delivered strong organic growth, Chemring added.It also said that it is in the process of replacing its chairman, Ken Scobie, who was appointed in 1997 and is 71.