First of all bc this is how an exchange would go between Lestat and Louis:

“Come in, Eagle One, this is Currently Doing That. Over.”

“Roger, Currently Doing That, what is your ETA? Over.”

“I should be there in about thirty minutes after I rendezvous with It Happened Once in a Dream and If I Had to Pick a Chick. Do you have Been There Done That with you? Over.”

“Sounds good, yes, I have Been There Done That and Eagle Two is on his way as well. Over.”

“Roger that. Currently Doing That: over and out.”

Let me explain u a thing: Well the “Eagle One” thing… he goes with Eagle bc it’s an American symbol of freedom and kickassery. It’s supposed to inspire patriotic and powerful feels.

So the “Eagle Two” thing is funny because… “Eagle One” starts us thinking everyone will just be numerical, like Eagle One, Eagle Two, Eagle Three, etc. but he immediately goes into these code names that are descriptions of how he feels about (or relates personally to) each member of the “team,” like “Been there done that” is someone he slept with, “It happened once in a dream” is like saying “I would be into you in a fantasy situation only”… and they’re all kinda negative in a way. Like ‘Ugh, well, “If I HAD to pick a chick” it would be Jesse.’ we all know Lestat is pansexual so that’s not as funny as it is in Parks & Rec bc Andy is meant to be straight.

When he hesitates on choosing a code name for that last person, it’s because he has no romantic feelings for (and doesn’t really have an opinion about) him, so “Eagle Two” is like, “Hmmm I am neutral towards you.” Which is better than something negative or crude. Hence, Daniel goes, “Thank God” bc he’s glad Lestat has spared him potential humiliation ;] 

Especially humiliating to each other bc they’re expected to contact each other with these code names.