Final answer:
Adequate Intake (AI) is the most suitable measure for a soldier's daily intake of omega-3 fatty acids in the absence of a Recommended Dietary Allowance (RDA). AIs provide guidelines when scientific evidence is insufficient to establish an EAR and subsequent RDA.
Step-by-step explanation:
The best measure to assess a soldier's daily intake of omega-3 fatty acids would be Adequate Intake (AI). When the Recommended Dietary Allowance (RDA) is not available because of insufficient evidence, AI is used as a guide. AI is set when there's not enough information to determine an EAR and consequently the RDA for all age groups. Omega-3s, like DHA and EPA, are important nutrients for maintaining good health, particularly for individuals like soldiers who may have high physical demands. Fish oil and omega-3 supplements are commonly used to meet these needs, particularly among those who do not consume enough seafood as recommended by the Dietary Guidelines for Americans.