Why Drill was the name of the alien leader?

Drill might have aptly been named for his purpose on the planet..... boring a hole (drilling) through the earth's impregnable defenses.

‘That’s the word Drill used! Impreg – That was the word, Mom.’

‘My, my, Drill’s a brilliant little boy. Two-bit words.’

‘They couldn’t figure a way to attack, Mom. DrilI says – he says in order to make a good fight you got to have a new way of surprising people. That way you win. And he says also you got to have help from your enemy.’