What color t-shirt is worn under the OCP jacket?

The correct answer is tan or Coyote Green because these colors are specifically authorized for wear under the Operational Camouflage Pattern (OCP) jacket in a military setting. The use of these neutral tones ensures uniformity and cohesion within the camouflage design, which is essential for maintaining the effectiveness of the OCP in various environments.

This color choice is designed to blend with the OCP's overall color scheme, enhancing the uniformity of appearance among personnel. The other colors listed, such as black, white, or desert camouflage, do not align with the official regulations for what is permissible underneath the OCP jacket, as they could disrupt the intended camouflage effect or clash with the overall design of the uniform. Thus, wearing the appropriate colors like tan or Coyote Green helps uphold military standards and operational effectiveness.