 The War Office also considered the Tetrarch 's cooling system faulty , making the tank unsuitable for service in hotter climates , such as the Middle East and North Africa . 
 The War Office also considered the Tetrarch <a href='null_genetive' title='1'><mark>'s</mark></a>cooling system faulty , making the tank unsuitable for service in hotter climates , such as the Middle East and North Africa . 
Da War Office also considered the Tetrarch  cooling system faulty , wit the tank unsuitable fir service in hotter climates , such as the Middle East and North Africa .