王子骑马走在卫队的前头。

The prince rode at the head of his regiment.

《牛津词典》

查尔斯王子身穿威尔士警卫队的制服，在他的官方生日照片上，他看上去如此放松和满不在乎。

No wonder he looks so relaxed and nonchalant in the uniform of his military regiment, the Welsh Guards, which he wore for his official birthday portrait.

youdao

一路上威廉王子和哈利王子都在不同时间间隔的致敬(当经过警卫队？或是纪念碑？)

Also, the way he and Prince Harry both saluted a various intervals when passing guard formations?

youdao