In a large saucepan cook pasta according to package directions. Drain. Rinse with cold water. Drain again.
Meanwhile, for dressing, in a large bowl combine mayonnaise dressing, Italian dressing, green onion (if desired), orange juice, salt, and pepper.
Add cooked pasta to dressing. Toss well to combine. Gently stir in orange sections, tuna, and pea pods. Cover and chill for 4 to 24 hours. Before serving, if necessary, stir in a little milk to moisten. Makes 6 main-dish servings.