to swear upon the Holy Writ to speak the truth

Feet wet: Fighter direction brevity code used to report that a plane had left land (feet dry) and was now over water.

[A]bout the beginning of the war the greatest concern of [Ulysses Simpson] Grant was to get a good boardwalk laid from his house to the store. […] It is related, that after one of his great victories, some gentlemen of Galena had the walk laid, and telegraphed the General: Rest easy, the walk is down.

They choose from a menu of regular challenges, superchallenges, or megachallenges.