Economy Big US participation in Chennai DefExpo Updated : April 10, 2018 06:13 AM IST DefExpo 2018 will see 19 US companies exhibiting while many more will be participating. 154 foreign companies participating in the DefExpo this year Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.