five, five-man squad, file, line
伍 centers on the number five and groups of five, especially in military or organizational contexts: a five-man squad, a file, or a line of five.
伍 combines 亻 (person) with 五 (five), originally referring to a group of five people, such as a military squad.
A person 亻 plus the number five 五: imagine five soldiers standing in a line, forming a five-man squad.
For ゴ, picture five people going into formation: go -> ゴ, as they line up in a file of five.
corporal
company; group; class
straggling; falling behind; being left behind; dropping out
full particulars; the whole story; from beginning to end
to rank with; to rank among
to rank with; to rank among
rank and file; the ranks
dropout; straggler; outcast; failure
rank (of troops); line; formation; array; procession