This is a handout photo from Boeing, which provides these pictures to journalists who, like me, register at their Web site. Here is the Boeing-supplied cutline:
"In the cargo compartment the C-17 can carry [U.S.] Army wheeled vehicles in two side-by-side rows. The C-17 is the only aircraft that can airdrop outsize firepower, such as the Armys Sheridan tank, or the Bradley infantry fighting vehicle, if the Bradley is refitted to be airdrop capable. Three Bradley armored vehicles comprise one deployment load for the C-17. Similarly, the Armys newest main battle tank, the M-1, can be carried in conjunction with other vehicles."
This photo was digitized by Boeing in August, 1997.