that surprised them. >> my gosh. they're going against the wind. >> reporter: this video is from a u.s. military training mission off the coast of jacksonville, florida in 2015. ufos and american military pilots have seen so many recent years. they have under taken a large scale investigation. u.s. officials found no evidence to confirm those objects are alien spacecraft but they can't rule out that possibility, that's according to five sources familiar with an upcoming report for congress. >> there is a lot they can't say and a lot they don't know from scientific standpoint but there are kclassification issues. >> reporter: cnn has spoke to formal navy pilot who can't explain objects they saw on