[Protest of Army Rejection of Bid]

A firm protested the Army's rejection of its bid as nonresponsive, contending that the Army should have accepted its late acknowledgement of a solicitation amendment as a bid modification, since its bid was low and otherwise responsive. GAO held that the Army properly rejected the bid, since: (1) it failed to acknowledge the amended delivery date, which was a material change; and (2) acceptance of a nonresponsive bid would have compromised the integrity of the competitive bidding system. Accordingly, the protest was dismissed.