Bond (007) wants to move from a point A to point D, but here 2 watchtowers (B…

Bond (007) wants to move from a point A to point D, but here 2 watchtowers (B & C) are present in the way of A to D. soldier on watchtowers has rifles with range of 1 kilometer. A,B,C,D are in straight line and distance between All points is 1 kilometer respectively. Find the minimum distance covered by 007 in journey between point A to D while his distance from watchtowers is always >=1.