Heroux-Devtek Inc. will layoff about 55 employees at one of its Montreal-area plants due to lower demand from the U.S. military market. The layoffs are expected to start in April and take place over 12 months, leaving 15 workers at the plant in nearby Longueuil. The company announced that its operations in Longueuil will be centered at its upgraded, main plant where 360 employees will focus on repair, overhaul and assembly of landing gear systems. The company announced that the layoffs will result in a charge of about $5 million before income taxes to be spread over the fourth quarter of the fiscal year ended March 31, 2014 and the first half of the 2015 fiscal year.