(b) The f-35 helmet costs $400,000. "In the context of a plane costing between $148m and $337m, depending on exactly which model you order, the price of the helmet is, perhaps, trivial. * * * The helmet is a wonder. Fighter pilots have long been used to a “heads-up” display—an image of cockpit data and targeting information displayed on the windscreen in front of them. The F-35 helmet goes much further. Not only does it display that detail, and much else besides, on the helmet's visor but it also takes video images from six external cameras mounted around the aircraft and shows that as well. This allows the pilot to 'look through' the aircraft at any angle. Want to see what is happening below? Then look down and instead of your lap you see the ground. The projected view also doubles up as a night-vision system, without the pilot having to put on a special set of goggles."
(i) visor (n) http://www.merriam-webster.com/dictionary/visor
A baseball cap also has a visor, too -- but projecting horizontally rather than vertically.
(ii) This "besides" is not a preposition.
(c) "The helmet * * * has been developed by a joint venture between Rockwell Collins, an American company, and Elbit Systems, an Israeli one, working with Lockheed Martin."
(i) Rockwell Collins https://en.wikipedia.org/wiki/Rockwell_Collins
(Headquarters Cedar Rapids, Iowa; After facing financial difficulties, the Collins Radio Company [founded by Arthur Collins in 1933 in Cedar Rapids] was purchased by Rockwell International in 1973)
(ii) Rockwell International Corporation. Encyclopaedia Britannica, undated https://www.britannica.com/topic ... ational-Corporation
("The main company was incorporated [by Willard Rockwell] in 1928 as North American Aviation, Inc., a holding company for a number of aviation companies, but it switched to aircraft manufacturing when it received a contract from the Army Air Corps for 42 planes)
(e) "Had the F-35's cockpit not been positioned lower than those of other fighter jets to reduce its radar signature, pilots would be able to see more with their own eyes. There are old-school ways around that: one F-35 pilot says he sometimes banks the aircraft over when he wants to see what is going on below."
(i) bank (vi): "to incline an airplane laterally" www.merriam-webster.com/dictionary/bank
(ii) aircraft principal axes https://en.wikipedia.org/wiki/Aircraft_principal_axes
("The roll axis (or longitudinal axis[4]) passes through the plane from nose to tail. The angular displacement about this axis is called bank")