What is the test for a jury to interpret the word "willfull" in the words "reckless disregard"?

Our examination of the instructions as revealed by the record convinces us that the jury was clearly instructed. The instructions sufficiently defined the word "willfull" so as to exclude "reckless disregard." Instructions similar to those given here have been upheld in Cooley v. United States, 501 F.2d 1249, 1252-53 (CA9 1974), cert. denied, 419 U.S. 1123, 95 S.Ct. 809, 42 L.Ed.2d 824 (1975), and United States v. Hawk, 497 F.2d 365 (CA9 1974), cert. denied, 419 U.S. 838, 95 S.Ct. 67, 42 L.Ed.2d 65.