You take one bomber and deploy him in Baghdad, and another is manufactured in Riyadh the next day. It's exactly like when you take the toy off the shelf at Wal-Mart and another is made in Shen Zhen the next day. ↗
When they do bring on new people, it's good for the show. It's like getting a new toy. The writers enjoy it because it's a whole new character that they can write for, one that they aren't used to writing for. They can try different things. ↗