CORRECTED: China drone maker steps up security after U.S. Army ban

By Alwyn Scott(Reuters) - (The story corrects headline and first paragraph to remove reference to DJI hoping to regain the U.S. Army as a client.Corrects DJI headquarters to Shenzhen, not Shanghai.)Chinese drone maker SZ DJI Technology Co Ltd is tightening data security on its drones after the U.S. Army ordered its members to stop using DJI drones because of "cyber vulnerabilities," a company official told Reuters on Monday.The privately held Shenzhen-based company is speeding deployment of a sy