"All persons are required to wear oxygen masks, Cadets," the sergeant announced, handing over two masks. "And I would suggest that you leave this section of the city as quickly as possible. The screens are leaking badly again. We may have to close off this section too."
Tom and Astro took the masks but did not put them on.
"Thanks, Sergeant," said Tom. "But we'll probably be around here for some time. We're on special duty with Commander Walters and Captain Strong."
At the mention of Strong's name, the sergeant started, looked at the boys closely, and then smiled. "Say, aren't you Corbett and Astro?"
"That's right," acknowledged Tom.
"Well, don't you remember me?" asked the sergeant.
Tom looked at him closely and then smiled in sudden recognition. "Morgan! Phil Morgan!" he cried.
"Of course," chimed in Astro.
"Sure," said the sergeant. "We went through our first test together at the Academy and I washed out."