The basic transportation section of the U. S. Government Test Specification MIL-STD-810D, Method 514. 3, Paragraph I-3. 2. 1, Page 514. 3-5. Basic transportation defines the test profiles that have been defined for equipment that is shipped as secured cargo; by land, by sea or by air. The test levels are based upon land transport stress levels because these are higher than stresses imposed by air or sea transportation environments