 Despite similarities in missile air frame , the Martlet 2A, 2B, and 2C featured differences in their structural materials and mechanical details.
<fluency>  Despite similarities in missile air frame , the Martlet 2A, 2B, and 2C featured differences in their structural materials and mechanical details.
 Despite similarities in missile airframe , the Martlet 2A, 2B, and 2C featured differences in their structural materials and mechanical details.