This compound subject, therefore, requires a singular verb to agree with it. SUBJECT-VERB RULE #2 Two or more SINGULAR subjects joined by or (or nor) act as a singular compound subject and, therefore, take a singular verb to agree.
For example, You can't help but see how he feels about her; he wears his heart on his sleeve. Shakespeare had it in Othello (1:1): But I will wear my heart upon my sleeve for daws to peck at. People who wear their heart on their sleeve express their emotions freely and openly, for all to see.
The ranks worn on the sleeve are common to all RAF uniform variants incorporating the Jacket. The centre of the rank (measured from the bottom of the lowest braid to the top of the highest) should be 3 3/4 (9.5 cm) from the cuff and each row of braiding should have a space of 1/8 (3mm) from other rows.