Military Vessel, War Fleet
noun
What do a warship and a rowboat have in common? In wartime they're both considered military vessels.
かんてい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
海軍の艦艇の乗組員が不足しています。
The crew of the navy’s war fleet is lacking.