'TLB' would this opinion have any bearing? [20 Apr 2017]
"...Service leaders have urged moving forward with Block 4 development plans because of the need to stay ahead of the rapidly advancing threat of adversary air defense systems and aircraft. They also base that suggestion on
experience with operational F-35s, which they have said are performing well and meeting or exceeding expectations, even with the transitional 3i software."
http://www.airforcemag.com/Features/...F-is-Done.aspx