Final answer:
A health professional can measure a soldier for body fat using methods such as the skin-fold test, DEXA, or underwater weighing.
Step-by-step explanation:
A health professional, such as a clinician or a public health worker, can measure a soldier for body fat. One method commonly used is the skin-fold test, where a caliper is used to measure the thickness of skin on different parts of the body. Another method is the use of advanced techniques such as Dual-energy X-ray absorptiometry (DEXA) or underwater weighing.