The Military Salute 军礼
In spite of the minor differences, military salutes of many countries have the similar gesture: raising the right hand to the same side of the head. A fanciful idea of the origin of the military salute is that it dates from medieval tournaments, when knights addressed the queen in this manner to shield their eyes from her blinding beauty. A more credible explanation is that in the age of visored and armored horsemen, raising the visor was a signal between two knights that they meant each other no harm: the gesture provided recognition and with it the promise of amity.
Note:
fanciful 想象出来的，别出心裁的
tournament （中古时期的）马上比武大会，比赛
knight （欧洲中世纪）骑士，武士
address 向……打招呼
blinding beauty 令人眩目的美丽
credible 可信的，可靠的
visor （古时盔的）面甲，脸盔；（用脸盔等）遮护
armor 为……穿盔甲
amity 友好，和睦