Reinforcement units

[exeteroborach]

Hey all, hope this is the correct forum. 
I know that in Matched Play reinforcement units cannot arrive turn1 but what about Open Play? I had a game with my Tau and we used the Open War Deck instead of Matched Play. I wanted to use the Manta ability( which is not considered to be Strategic Reserve) for my Crisis Suits turn 1 but my opponent said they couldn't come in till turn 2. I looked through the brb but only found that restriction in regards to Matched play missions. He looked up the FAQ on the brb and said that it clarified that you can't bring them in turn 1 but when I checked the faq I only saw the comment about Crusade Pack missions and deployment? 
Are you allowed to deploy reinforcement units turn 1 in Open Play? 
Thanks. 

[piersonsmuppet]

Second sentence of open play book, "In open play anything goes...". There is no restriction on when reinforcement units may arrive in open play and can enter T1. Was your opponent maybe wanting to play an Open Play mission with matched rules?

[exeteroborach]

Okay. Thanks for the response. No, I think he just didn't want my suits or commander to drop in and clear him off his objectives.