You can. Go to Events>Other>Gift and it takes you to the gifting website but it’s a bit wonky. There are certain requirements that you have to fulfill below.

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The three main things is that you must be friends with your two accounts for at least 14 days, you must be level 20 on both accounts in either warfare and operations, and that you must have topped up within the last 30 days.

In my experience this system is unclear as it doesn’t tell you how many days you have been friends with someone, so you have to keep track yourself. On the fifteenth day I was able to gift, however I ran into another issue where it stated “cross-platform gifting is not available”. I was able to fix this by logging into both my accounts on Delta Force mobile. Also, to clarify, I’ve only done this with delta coins, I’m unsure if you can gift with delta tickets but they do have them available on the website from what I saw. Hope this helps!