Cassidy, Marshburn and Barratt in the A/L during STS-127 / Expedition 20 Joint Operations

S127-E-006871 (18 July 2009) ---Two soon-to-be space-walking astronauts--Dave Wolf and Tim Kopra--although barely visible in the International Space Station's Quest airlock in the rear of this frame, are the primary focus of the three supportive astronauts in the foreground. From the left are astronauts Christopher Cassidy, Mike Barratt and Tom Marshburn. The July 18 extravehicular activity kicks off a series of five spacewalks scheduled over the next several days.