Members of the navy or other sailors are not represented by an emoji profession sequence yet. It would either use any kind of ship/boat 🚢 ⛵ 🛥️ ⛴️ 🛳️ or the anchor ⚓ as a determiner to a 👩 or 👨 base.

Standard References

• Unicode Technical Standard 51 “Unicode Emoji” (beta)
• How to propose emojis to Unicode
• How to propose other additions or changes to Unicode (required form, email address: docsubmit＠unicode.org)
• Unicode document submission form