Physical skill sets are 100% genetic gentlemen...some skills are passed down and some are not but to say that specific physical skill sets are not genetic is uninformed.
How many baseball players are third generation pros? Football? yep...and for the coup de gras...guess what a Congressional Medal of Honor winner receives other than flying anywhere for free for his lifetime? Any guesses? HIS CHILDREN ARE GRANTED CONGRESSIONAL APPOINTMENTS TO ANY MILITARY ACADEMY OF THEIR CHOICE. Now, while being heroic is not specifically a "skill" it is a character trait and that character trait is recognized as possibly being "passed from generation to generation"....is character, or lack thereof, a genetic trait or environmental? The skill set that IS applicable to about 99% of the CMH winners is a calm, cool, head under life-taking circumstances WHILE acting or giving orders that saved a ton of lives and that, my friends, is a skill. Even falling on a grenade required the forethought and the critical decision making process that becomes selfless...it may appear to be "reaction" or instinct but you and I know different...they knew they were going to die to save someone else and they made that decision.
Hand-eye coordination is genetic....great vision....genetic....my bet is you will find a significant amount of information regarding military genetic studies; and physical skills and flying, naysayers, is a specific set of skills....including taking G's. Im sure there are folks that have such great hand-eye skills they can play handball with the curb but put them in a high-performance aircraft and they will blow chunks everytime you turn it.
Good SA comes from experience....but if you can't fly the plane well...who cares how good your SA is? The tools to have good SA ARE genetic...excellent vision, excellent spacial aperception, excellent depth perception....those are God given gifts.
I am not saying that EVERY physical skill is passed on to heirs....I am saying its biologically impossible not to pass some. Hey, its how human genes work men and if you deny that, well, you need to go back to school.